2023 Exam Questions
Q. If a circular coil of 100 turns with a cross-sectional area of 1 m2 is kept with its plane perpendicular to the megnetic field of 1 T, the ,magnetic flux linked with the coil will be _____.
(A) 1 Wb
(B) 50 Wb
(C) 100 Wb
(D) 200 Wb
Q. Derive an expression for energy stored in the magnetic field in terms of induced current.
Q. Explain, why the equivalent inductance of two coils connected in parallel is less than the inductance of either of the coils.
Q. A wire 5 m long is supported horizontally at a height of 15 m along east-west direction. When it is about to hit the ground, calculate the average e.m.f. induced in it. (g = 10 m/s2)
2022 Exam Questions
Q. A small piece of metal wire is dragged across the gap between the pole pieces of magnet in 0.5 second. The magnetic flux between the pole pieces is 8 x 10-4 weber. The emf induced in the wire is _____.
(A) 1.6 millivolt
(B) 16 millivolt
(C) 1.6 volt
(D) 16 volt
Q. Derive an expression for emf (e) generated in a conductor of length (l) moving in uniform magnetic field (B) with uniform velocity (v) along x-axis.
Q. An aircraft of wing span of 50 m flies horizontally in earth’s magnetic field of 6 x 10-5 T. Calculate the velocity required to generate an e.m.f. of 1.2 V between the tips of the wings of the aircraft.
Q. Two inductor coils with inductance 10 mH and 20 mH are connected in series. What is the resultant inductance of the combination of the two coils?
Q. An emf of 91 mV is induced in the windings of a coil, when the current in a nearby coil is increasing at the rate of 1.3 A/s, what is the mutual inductance (M) of the two coils in mH?
Q. An emf of 96.0 mV is induced in the windings of a coil when the current in a nearby coil is increasing at the rate of 1.20 A/s. What is the mutual inductance (M) of the coils ?
