1.
A conducting rod of length l moves with velocity v perpendicular to a magnetic field B. The induced emf is
2.
A coil has 500 turns. If the magnetic flux through each turn changes uniformly from 0.2 Wb to 0 in 0.5 s, the induced emf is
3.
If the speed of the rod is doubled, the induced emf becomes
4.
The phenomenon of mutual induction occurs between
5.
The SI unit of mutual inductance is
6.
A rectangular conducting loop moves completely inside a region of uniform magnetic field with constant velocity. The induced current in the loop is
7.
The self-inductance of a coil depends upon
8.
The energy stored in an inductor is
9.
The coefficient of self-induction increases when
10.
Lenz's law predicts the
11.
A bar magnet is pulled away from a conducting loop. The induced current will
12.
Assertion (A): A changing magnetic field can induce an emf even without physical contact. Reason (R): A changing magnetic flux produces an induced electric field.
13.
Assertion (A): No emf is induced when magnetic flux through a closed loop remains constant. Reason (R): Faraday's law depends on the rate of change of magnetic flux.
14.
The eddy currents produced in a conductor are
15.
Laminated iron cores are used in transformers to
16.
Match the Columns: Column–I P. Faraday's Law Q. Lenz's Law R. Fleming's Right-Hand Rule S. Eddy Current Column–II 1. Direction of induced current 2. Electromagnetic braking 3. Magnitude of induced emf 4. Direction of induced emf Choose the correct matching.
17.
The magnetic flux through a coil is maximum when the magnetic field is
18.
The induced emf becomes zero when
19.
An ideal transformer works on the principle of
20.
The induced current in a closed circuit exists
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