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Standard XII
Physics
Damped Oscillations
A wire loop i...
Question
A wire loop is rotated in a magnetic field.The frequency of change of direction of the induced e.m.f.is (1) Twice per revolution (2) Four times per revolution (3) Six times per revolution (4) Once per revolution
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Q.
A rectangular coil of copper wire is rotated in a magnetic field. The direction of induced current changes once in each:
(a) two revolutions
(b) one revolution
(c) half revolution
(d) one-fourth revolution
Q.
Question 4
Choose the correct option.
A rectangular coil of copper wires is rotated in a magnetic field. The direction of the induced current changes once in each
(a) two revolutions
(b) one revolution
(c) half revolution
(d) one-fourth revolution
Q.
A copper disc of radius
0.1
m is rotated about its center with
20
revolution per second in a uniform magnetic field of
0.1
T with its plane perpendicular to the field. The emf induced across the radius of the disc is?
Q.
The angular velocity of a body changes from one revolution per 9 second to 1 revolution per second without applying any torque. the ratio of its radius of gyration in the two cases is,
Q.
The angular velocity of a body changes from one revolution per
9
seconds to
1
revolution per second without applying any torque the ratio of its radius of gyration in the two cases is.
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