1.
The magnitude of induced emf in a coil is proportional to
2.
A conducting rod moves with constant velocity in a uniform magnetic field. Induced emf is zero when the rod moves
3.
The SI unit of magnetic flux is
4.
A coil is rotated in a uniform magnetic field. The induced emf becomes maximum when the plane of the coil is
5.
North pole of bar magnet is moved towards a closed conducting coil. According to Lenz's law, the face of the coil near the magnet becomes
6.
According to Faraday's first law, induced current is produced only when
7.
The direction of induced current is obtained by
8.
The work done against the induced current during electromagnetic induction appears as
9.
Which device works mainly on the principle of mutual induction?
10.
The energy stored in an inductor carrying current III is
11.
Assertion (A): Lenz's law is consistent with the law of conservation of energy. Reason (R): The induced current always opposes the change producing it.
12.
Assertion (A): No induced emf is produced if magnetic flux through a coil remains constant. Reason (R): Faraday's law depends on the rate of change of magnetic flux.
13.
Eddy currents are minimized by using
14.
A rectangular loop enters a region of uniform magnetic field. The induced current exists
15.
If the number of turns in a coil is doubled, the induced emf becomes
16.
Match the Columns: Column–I P. Faraday's Law Q. Lenz's Law R. Eddy Currents S. Transformer Column–II 1. Opposes the cause 2. Mutual induction 3. Induced emf 4. Electromagnetic braking Choose the correct matching.
17.
The coefficient of self-induction depends upon
18.
The commercial application of eddy currents is
19.
An ideal transformer has efficiency
20.
The negative sign in Faraday's law represents
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