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When the coils of an electric generator ...

When the coils of an electric generator rotate in a megnatic field,

A

the mechanical energy changes into electric energy.

B

the thermal energy changes into electric energy.

C

the solar energy changes into electric energy.

D

the wind energy changes into electric energy.

Text Solution

Verified by Experts

The correct Answer is:
A
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Knowledge Check

  • An electric coil rotates in a magnetic field

    A
    in a motor but not in a dynamo
    B
    in a dynamo but not in a motor
    C
    in a motor as well as in a dynamo
    D
    neither in a motor nor in a dynamo

  • A coil rotates in a magnetic field

    A
    in a motor, but not in a generator
    B
    in a generator, but not in a motor
    C
    neither in a motor nor in a generator
    D
    in a motor as well as a generator

  • A circular coil has 275 turns and a radius of 0.045 m. The coil is used as an ac generator by rotating it in a 0.500 T magnetic field, as shown in the figure. At what angular speed should the coil be rotated so that the maximum emf is 175 V?

    A
    28 rad/s
    B
    200 rad/s
    C
    50 rad/s
    D
    490 rad/s

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    The coil of an ac generator rotates at a frequency of 60 Hz and develops an induced emf of 120 V (rms) . The coil has an area of 3.0 xx 10^(-3) m^(2) and consists of 500 turns. The magnitude of the magnetic field in which the coil rotates is

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