If μ0 be the permeability and K0 the dielectric constant of a medium, its refractive index is given by

(1) 1μ0K0

(2) 1μ0K0

(3) K0

(4) μ0K0

Subtopic:  Properties of EM Waves |
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If ε0 and μ0 represent the permittivity and permeability of vacuum and ε and  μ represent the permittivity and permeability of the medium, the refractive index of the medium is given by:

1. ε0μ0εμ

2. εμε0μ0

3. εμ0ε0

4. μ0ε0ε

Subtopic:  Properties of EM Waves |
 72%
From NCERT
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The magnetic field between the plates of radius 12 cm separated by a distance of 4 mm of a parallel plate capacitor of capacitance 100 pF along the axis of plates having conduction current of 0.15 A is

(1) zero

(2) 1.5 T

(3) 15 T

(4) 0.15 T

Subtopic:  Maxwell's Equations |
 59%
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A flood light is covered with a fitter that transmits red light. The electric field of the emerging beam is represented by a sinusoidal plane wave

Ex=36 sin (1.20×107 z-3.6×1015 t) V/m

The average intensity of beam in W/m2 will be

(1) 6.88 

(2) 3.44

(3) 1.72

(4) 0.86

Subtopic:  Properties of EM Waves |
 57%
From NCERT
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A larger parallel plate capacitor, whose plates have an area of 1 m2 are separated from each other by 1 mm, is being charged at a rate of 25.8 V/s. If the plates has dielectric constant 10, then the displacement current at this instant is

(1) 25 μA

(2) 11 μA

(3) 2.2 μA

(4) 1.1 μA

Subtopic:  Maxwell's Equations |
 75%
From NCERT
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A parallel plate capacitor with plate area A and separation between the plates d, is charged by a constant current i.  Consider a plane surface of area A/2 parallel to the plates and drawn symmetrically between the plates. The displacement current through this area is

(1) i

(2) i/2

(3) i/4

(4) i/8

Subtopic:  Maxwell's Equations |
 77%
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The sun delivers 104 W/m2 of electromagnetic flux to the earth's surface. The total power that is incident on a roof of dimensions (10×10) m2 will be

(1) 104 W

(2) 105 W

(3) 106 W

(4) 107 W

Subtopic:  Electromagnetic Spectrum |
 85%
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The wave of wavelength 5900 A0 emitted by any atom or molecule must have some finite total length which is known as coherence length. For sodium light, this length is 2.4 cm. The number of oscillations in this length will be

(1) 4.068×108

(2) 4.068×104

(3) 4.068×106

(4) 4.068×105

Subtopic:  Properties of EM Waves |
 64%
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The transmitting antenna of a radio station is mounted vertically. At a point 10 km due north of the transmitter, the peak electric field is 10-3 V/m. The amplitude of the radiated magnetic field is

(1) 3.33×10-10 T

(2) 3.33×10-12 T

(3) 10-3 T

(4) 3×105 T

Subtopic:  Properties of EM Waves |
 76%
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A circular ring of radius r is placed in a homogeneous magnetic field perpendicular to the plane of the ring. The field B changes with time according to the equation B = Kt, where K is a constant and t is the time. The electric field in the ring is

(1) Kr4

(2) Kr3

(3) Kr2

(4) K2r

Subtopic:  Generation of EM Waves |
 68%
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