Electromagnetic Waves and their Characteristics NEET Questions

Physics - Electromagnetic Waves

Electromagnetic Waves and their Characteristics MCQ Questions


7.
The dimensions of displacement current are the same as those of:
A.
Electric current
B.
Electric charge
C.
Electric field
D.
Magnetic flux
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ANSWER :
A. Electric current
8.
Which of the following can produce a magnetic field?
A.
Both conduction current and time-varying electric field
B.
Only conduction current
C.
Only static electric field
D.
Only stationary charges
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ANSWER :
A. Both conduction current and time-varying electric field
9.
If the electric flux through a surface is constant, the displacement current through it is:
A.
Equal to Īµā‚€ times the flux
B.
Equal to conduction current
C.
Infinite
D.
Zero
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ANSWER :
D. Zero
10.
In a region of space, there is no conduction current but there is a time-varying electric field. In this region:
A.
Both fields are zero
B.
A magnetic field exists due to displacement current
C.
No magnetic field exists
D.
Only electric field exists
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ANSWER :
B. A magnetic field exists due to displacement current
11.
The SI unit of Īµā‚€(dĪ¦E/dt) is:
A.
Volt
B.
Ampere
C.
Weber
D.
Tesla
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ANSWER :
B. Ampere
12.
Maxwell's equations describe:
A.
All basic laws of electromagnetism
B.
Only electric phenomena
C.
Only magnetic phenomena
D.
Only optical phenomena
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ANSWER :
A. All basic laws of electromagnetism