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There are certain material developed in laboratories which have a negative refractive index (Fig). A ray incident from air (medium 1) into such a medium (medium 2) shall follow a path given

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

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Monochromatic light of wavelength 589 nm is incident from air on a water surface. What are the wavelength, frequency and speed of refracted light? Refractive index of water is

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

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If the above experiment is repeated of interference, by replacing two sources to a single slits of width 1mm. What would be the thickness of central

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Obtain the de Broglie wavelength of a neutron of kinetic energy 150 eV. As you have seen in Exercise .31, an electron beam of this energy is suitable for crystal diffraction experiments. Would a neutron beam of the same energy be equally suitable? Explain. (mn = 1.675 × 10–27

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

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A 0.20 Kg aluminum block at `80^oC` is dropped in a copper calorimeter of mass 0.05 Kg containing `200 cm^3` of ethyl alcohol at `20^oC`. What is the final temperature of the mixture? Given Density of ethyl alcohol = `0.81 g | cm^3` ; specific heat of ethyl alcohol `= 0.6 cal | g | '^oC` ; specific heat of copper `= 0.094 cal | g | '^oC`, specific heat of `Al = 0.22 cal | g |

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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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

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

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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

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

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A coil having n turns & resistance `ROmega` is connected with a galvanometer of resistance `4ROmega`. This combination is moved from a magnetic field W1 Wb to W2 Wb in t second. The induced current in the circut

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

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When a train travels with a speed `360 km h^(-1)` along the track separated by 1 meter. The vertical component of earth's magnetic field is `0.1xx 10^(-4) T` .What is the value of induced emf between the rails

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

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

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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

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

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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 .

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

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You have learnt in the text how Huygens’ principle leads to the laws of reflection and refraction. Use the same principle to deduce directly that a point object placed in front of a plane mirror produces a virtual image whose distance from the mirror is equal to the object distance from the

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

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A point positive charge is brought near an isolated conducting sphere (Fig. 1.2). The electric field is best given

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

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There is another useful system of units, besides the SI/mks A system, called the cgs (centimeter-gram-second) system. In this system Coloumb’s law is given by`F=(Qq)/r^2 hatr` where the distance r is measured in cm (= 10–2 m), F in dynes (=10–5 N) and the charges in electrostatic units (es units), where 1es unit of charge =`1/[3] ×10^(-9)`The number [3] actually arises from the speed of light in vaccum which is now taken to be exactly given by c = 2.99792458 × 108 m/s. An approximate value of c then is c = [3] × 108 m/s. (i)

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

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A square loop of side 10 cm and resistance `2_Omega` is moved with velocity `v_o` as shown in fig. The uniform magnetic field is 3T with what speed should the loop be moved so that a steady current of 1.5 mA flows in the

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

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A circular coil of 500 turns encloses an area of `0.04 m^2`. A uniform magnetic field of induction `0.25 Wb'/'m^2` is applied perpendicular to the plane of the coil. The coil is rotated by 90° in 0.1 second at a constant angular velocity about one of its diameters. A galvanometer of resistance `25Omega` was connected in series with the the coil. The total charge that will pass through the galvanometer is

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

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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.

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

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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

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

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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

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

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