Electromagnetic Waves and their Characteristics NEET Questions

Physics - Electromagnetic Waves

Electromagnetic Waves and their Characteristics MCQ Questions


13.
Gauss's law for magnetism, ∮B·dA = 0, implies:
A.
Magnetic field is always zero
B.
Magnetic monopoles do not exist
C.
Electric charges create magnetic field
D.
Magnetic flux through any surface is positive
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ANSWER :
B. Magnetic monopoles do not exist
14.
Faraday's law in Maxwell's equations is written as:
A.
∮B·dl = -dΦE/dt
B.
∮E·dl = -dΦB/dt
C.
∮E·dA = Q/ε₀
D.
∮B·dA = 0
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ANSWER :
B. ∮E·dl = -dΦB/dt
15.
A capacitor of capacitance C is charged by a current i. The rate of change of potential difference between the plates is:
A.
i/C
B.
C/i
C.
iC
D.
i²C
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ANSWER :
A. i/C
16.
Electromagnetic waves are produced by:
A.
Charges moving with uniform velocity
B.
Accelerated charges
C.
Stationary charges
D.
Neutral particles
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ANSWER :
B. Accelerated charges
17.
In an electromagnetic wave, electric field E and magnetic field B are:
A.
Perpendicular to each other and to the direction of propagation
B.
Parallel to each other but perpendicular to direction of propagation
C.
Parallel to each other and to the direction of propagation
D.
Perpendicular to each other but parallel to direction of propagation
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ANSWER :
A. Perpendicular to each other and to the direction of propagation
18.
The speed of electromagnetic waves in vacuum is given by:
A.
c = √(μ₀/ε₀)
B.
c = 1/√(μ₀ε₀)
C.
c = μ₀ε₀
D.
c = √(μ₀ε₀)
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ANSWER :
B. c = 1/√(μ₀ε₀)