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When the switch S turned
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Mar 20, 2022
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12th Physics
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varun
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marks1
chapter6
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A 100 turn closely wound circular coil of radius 10 cm carries a current of 3.2 A.(i) What is the field at the centre of the coil?(ii) What is the magnetic moment of this coil? The coil is placed in a vertical plane and is free to rotate about a horizontal axis which coincides with its diameter. A uniform magnetic field of 2T in the horizontal direction exists such that initially the axis of the coil is in the direction of the field. The coil rotates through an angle of 90° under the influence of the magnetic field.(iii) What are
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Mar 20, 2022
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varun
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marks5
chapter4
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For a normal eye, the far point is at infinity and the near point of distinct vision is about 25cm in front of the eye. The cornea of the eye provides a converging power of about 40 dioptres, and the least converging power of the eye-lens behind the cornea is about 20 dioptres. From this rough data estimate the range of accommodation (i.e., the range of converging power of the eye-lens) of a normal
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Mar 20, 2022
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12th Physics
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varun
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marks3
chapter9
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Trace the rays of light showing the formation of an image due to a point object placed on the axis of a spherical surface separating the two media of refractive indices `n_1 and n_2`. Establish the relation between the distance of the object, the distance of image and the radius of curvature from the central point of the spherical surface. Hence, derive the expression of the lens maker's
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Mar 20, 2022
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12th Physics
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varun
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6.7k
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marks5
chapter9
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A point Q lies on the perpendicular bisector of an electrical dipole of dipole moment p. If the distance of Q from the dipole is r(much larger than the size of the dipole), then the electric field at Q is proportional
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Mar 20, 2022
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12th Physics
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varun
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6.7k
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marks1
chapter1
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What will be the effect on horizontal range of a projectile when its initial velocity is doubled, keeping the angle of projection
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Mar 19, 2022
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11th Physics
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marks1
chapter4
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Consider a metallic pipe with an inner radius of 1 cm. If a cylindrical bar magnet of radius 0.8cm is dropped through the pipe, it takes more time to come down than it takes for a similar unmagnetised cylindrical iron bar dropped through the metallic pipe.
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Mar 20, 2022
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marks2
chapter6
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A magnetic field B is confined to a region r ≤ a and points out of the paper (the z-axis), r = 0 being the centre of the circular region. A charged ring (charge = Q) of radius b, b > a and mass m lies in the x-y plane with its centre at the origin. The ring is free to rotate and is at rest. The magnetic field is brought to zero in time Δt. Find the angular velocity ω of the ring after the field
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Mar 20, 2022
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marks2
chapter6
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Potential difference across BC at time `t=l/(2v)` isA conducting square wire frame ABCD of side `l` is pulled by horizontal force so that it moves with constant velocity v. A uniform magnetic field of strength B is existing perpendicular to the plane of wire. The resistance per unit length of wire is `lambda` and negligible self inductance. If at `t= 0,` frame is just at the boundary of magnetic field.
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Mar 20, 2022
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12th Physics
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varun
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6.7k
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marks1
chapter7
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A long solenoid has 1000 turns. When a current of `4 A` flows through it, the magnetic flux linked with each turn of the solenoid is `4 xx 10^(-3)Wb`. The self-inductance of the solenoid
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Mar 20, 2022
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marks1
chapter6
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Induced CurrentThe steady current in the coil `C_2` as shown below produces a steady magnetic field. As coil `C_2` is moved towards the coil `C_1`, the galvanometer shows a deflection. This indicates that electric current is induced in coil `C_1`. When `C_2` is moved away, the galvanometer shows a deflection again, but this time in the opposite direction. This deflection is based upon the Faraday’s law of electromagnetic induction.The change in magnetic
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Mar 20, 2022
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12th Physics
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varun
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marks1
chapter6
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In Youngs double slit experiment the fring spacing can be increased by these methods. Write true or false. Correct if any statement is false.a) By decreasing distance.b) By increasing the wavelenghtc) By increasing the refractive index of the medium in which experiment is taking place (e.g. this experiment is originally done in air. This experiment can also be performed in water of higher refractive index)d) By increasing the distance between the two coherent sources.c) This experiment is not valid for other waves like Electromagnetic waves, Sound Waves
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Mar 20, 2022
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12th Physics
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varun
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6.7k
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marks1
chapter10
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Assertion: Moment of inertia of a particle is different whatever be the axis of rotation. Reason: Moment of inertia does not depends on mass and distance of the particle from the axis of
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Mar 19, 2022
in
11th Physics
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varun
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6.7k
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marks1
chapter7
#mcq
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A particle executing SH.M has a maximum displacement of 4 cm and its acceleration at a distance of 1 cm from its mean position is 3 cm/`s^2`. What will be its velocity when it is at a distance of 2cm from its mean
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Mar 19, 2022
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11th Physics
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varun
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6.7k
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marks2
chapter14
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Check that the ratio `(ke^2 )/(G m_e m_p)` is dimensionless. Look up a Table of Physical Constants and determine the value of this ratio. What does the ratio
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Mar 20, 2022
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12th Physics
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marks2
chapter1
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Which among the curves shown in Fig. cannot possibly represent electrostatic field lines?
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Mar 20, 2022
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12th Physics
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marks1
chapter1
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A coil of 0.01 henry inductance and 1 ohm resistance is connected to 200 volt, 50 Hz ac supply. Find the impedance of the circuit and time lag between max. alternating voltage and
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Mar 20, 2022
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12th Physics
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6.7k
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marks2
chapter7
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According the Gauss’s theorem, electric field of an infinitely long straight wire is inversely proportional to
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varun
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marks1
chapter1
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Electrostatic Potential Energy Electrostatic potential energy of a system of point charges is defined as the total amount of work done in bringing the different charges to their respective positions from infinitely large mutual separations.By definition, work done in carrying charge from `oo` to any point is W = Potential `xx` ChargeThis work is stored in the system of two point charges in the form of electrostatic potential energy U of the system.Two similar positive point charges each of `1 muC` have been kept in air at 1m distance from each other. What will be the potential
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Mar 20, 2022
in
12th Physics
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varun
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6.7k
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marks1
chapter2
#mcq
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Match the Column I (graph) with Column II (relation) and select the correct answer from the codes given below. Column I Column II A. p. Temperature dependence of resistivity for a typical semiconductor. B. q. Resistivity p of copper as a function of temperature T. C. r. Resistivity `rho` of nichrome as a function of absolute temperature T .
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Mar 20, 2022
in
12th Physics
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varun
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6.7k
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marks1
chapter3
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