Electromagnetic Induction Mock Tests

A conducting rod moves perpendicular to a magnetic field B with velocity v. The induced emf across its ends (length l) is:

A conducting loop is pulled out of a uniform magnetic field of 0.5 T with a constant velocity. The induced emf in the loop is 2 V and the resistance of the loop is 4 Ω. The rate at which heat is dissipated in the loop is:

A resistor of 100 Ω and a capacitor of capacitive reactance 100 Ω are connected in series across a 220 V AC source. The impedance of the circuit is:

A circular coil of radius 0.1 m with 100 turns is placed in a uniform magnetic field of 0.5 T perpendicular to its plane. The field is reduced to zero in 0.5 s. The induced emf in the coil is:

A magnetic flux of 4 × 10⁻⁴ Wb linked with a coil of 200 turns decreases to zero in 0.4 s. The magnitude of the induced emf is:

A circular coil of radius 10 cm and 100 turns is rotated about its vertical diameter in a uniform magnetic field of 0.2 T. If the angular speed is 10 rad/s, the maximum induced emf is: (π = 3.14)

A series LCR circuit with R = 100 Ω, L = 0.5 H, and C = 20 μF is connected to an AC source of variable frequency. The resonant frequency of the circuit is closest to:

The power factor of a series LCR circuit is 0.5. If R = 100 Ω, the impedance of the circuit is: