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Figure shows two charges of equal magnitude separated by a distance 2a. As we move away from the charge situated at x = 0 to the charge situated at `x=2a`, which of the following graphs shows the correct behaviour of electric field

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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The electric potential in a region is given by the relation `V(x) = 4 + 5x^2` . If a dipole is placed at position (–1,0) with dipole moment `vecp` pointing along positive Y-direction,

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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For an LCR circuit, the power transferred from the driving source to the driven oscillator is `P=I^2

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Proton in an Electric Field Potential difference `(DeltaV)` between two points `A and B` separated by a distance `x`, in a uniform electric field `E` is given by `DeltaV =-Ex`, where `x` is measured parallel to the field lines. If a charge `q_0` moves from A to B, the change in potential energy `(DeltaU)` is given as `DeltaU=q_0 DeltaV`. A proton is released from rest in uniform electric field of magnitude `8.0 xx 10^4 Vm^(-1)` directed along the positive X-axis. The proton undergoes a displacement of 0.50 m in the direction of E.Mass of a proton `= 1.66 xx 10^(-27)

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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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

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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An electron gun with its collector at a potential of 100 V fires out electrons in a spherical bulb containing hydrogen gas at low pressure (∼10–2 mm of Hg). A magnetic field of 2.83 × 10–4 T curves the path of the electrons in a circular orbit of radius 12.0 cm. (The path can be viewed because the gas ions in the path focus the beam by attracting electrons, and emitting light by electron capture; this method is known as the ‘fine beam tube’ method.) Determine e/m from the

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A positive charge +Q is fixed at a point A. Another positively charged particle of mass m and charge +q is projected from a point B with velocity u as shown in the figure. The point B is at the large distance from A and at distance d from the line AC. The initial velocity is parallel to the line AC. The point C is at very large distance from A. The minimum distance (in meter) of +q from +Q during the motion is `d (1+sqrtA)`. Find the value of A. [Take `Qq= 4πε_0 mu^2d and d=(sqrt2-1)`

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A polythene piece rubbed with wool is found to have a negative charge

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Two different loops are concentric & lie in the same plane. The current in outer loop is clockwise & increasing with time. The induced current in the inner loop then,

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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When the switch S turned

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(a) Sketch electric lines of force due to (i) isolated positive change (ie q>0) and(ii) isolated negative change ( ie q(b) Two point changes q and –q are placed at a distance 2a apart. Calculate the electric field at a point P situated at a distance r along the perpendicular bisector of the line joining the charges. What is the field when r >>

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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There are two coils A and B as shown in Fig A current starts flowing in B as shown, when A is moved towards B and stops when A stops moving. The current in A is counterclockwise. B is kept stationary when A moves. We can infer

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A solenoid is connected to a battery so that a steady current flows through it. If an iron core is inserted into the solenoid, will the current increase or decrease?

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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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.

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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The horizontal component of the earth’s magnetic field at a certain place is 3.0 ×10–5 T and the direction of the field is from the geographic south to the geographic north. A very long straight conductor is carrying a steady current of 1A. What is the force per unit length on it when it is placed on a horizontal table and the direction of the current is(i) east to west;(ii) south to

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Consider a light beam incident from air to a glass slab at Brewster’s angle as shown in Fig. A polaroid is placed in the path of the emergent ray at point P and rotated about an axis passing through the centre and perpendicular to the plane of the

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Find the electric field due to an infinitely long cylindrical charge distribution of radius R and having linear charge density `lambda` at a distance half of the radius from its

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Two point charges 100µc and 5µc are placed at points A and B respectively with AB = 40 cm. The work done by external force in displacing the charge 5µc from B to C where BC = 30 cm, angle `ABC = pi/ 2` and `1/(4piepsilon_o)=9xx 10^9 Nm^2' /'c^2`

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Which of the following combinations should be selected for better tuning of an LCR circuit used for

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Study the circuits (a) and (b) shown in Fig and answer the following questions. Can the rms current in circuit (b) be larger than that in

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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