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Electromagnetic Field Theory
A copper disc is rotated rapidly below a freely suspended magnetic needle. The magnetic needle starts rotating with velocity
less than that of disc and in the same direction.
less than that of disc but in opposite direction.
equal to that of disc and in the same direction.
equal to that of disc and in the opposite direction.
less than that of disc and in the same direction.
less than that of disc but in opposite direction.
equal to that of disc and in the same direction.
equal to that of disc and in the opposite direction.
Answer
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Related Question
Electromagnetic Field Theory
The attenuation in waveguide above to cut off frequency
Zero
Very low
Very high
Infinite
Zero
Very low
Very high
Infinite
Answer
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Electromagnetic Field Theory
For an inductor, current is proportional to
none of them.
voltage across the inductor.
both (A) and (B).
magnetic field.
none of them.
voltage across the inductor.
both (A) and (B).
magnetic field.
Answer
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Electromagnetic Field Theory
A metal sphere with 1 m radius and a surface charge density of 10 coulombs/m2 is enclosed in a cube of 10 m side. The total outward electric displacement normal to the surface of the cube is
40π C.
5 C.
10 C.
None of above.
40π C.
5 C.
10 C.
None of above.
Answer
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Electromagnetic Field Theory
Which of following is the unit of inductance?
Webers / m.
Milli- henry.
Ohm.
Ampere turns.
Webers / m.
Milli- henry.
Ohm.
Ampere turns.
Answer
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Electromagnetic Field Theory
A long straight wire carries a current I = 10A. At what distance is the magnetic field H = 1A/m?
1.39 m.
1.59 m.
1.29 m.
1.19 m.
1.39 m.
1.59 m.
1.29 m.
1.19 m.
Answer
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