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	Lenz’s law is expressed by the following formula (here e = induced e.m.f., $\varphi$ = magnetic flux in one turn and N = number of turns)
	A magnet is dropped down an infinitely long vertical copper tube
	An aluminium ring B faces an electromagnet A. The current I through A can be altered
	The magnetic flux linked with a coil at any instant ‘t’ is given by $\phi = 5t^3 – 100t + 300$, the e.m.f. induced in the coil at t = 2 second is
	A coil has $1,000$ turns and $500 cm^2$ as its area. The plane of the coil is placed at right angles to a magnetic induction field of $2 \times {10^{ - 5}}\,Wb/{m^2}$. The coil is rotated through ${180^o}$ in 0.2 seconds. The average e.m.f. induced in the coil, in milli-volts, is
	When a bar magnet falls through a long hollow metal cylinder fixed with its axis vertical, the final acceleration of the magnet is
	The magnetic flux linked with a vector area $\vec A $ in a uniform magnetic field $\overrightarrow B $ is
	The magnetic flux linked with a circuit of resistance 100 ohm increases from 10 to 60 webers. The amount of induced charge that flows in the circuit is (in coulomb)
	A magnet NS is suspended from a spring and while it oscillates, the magnet moves in and out of the coil C. The coil is connected to a galvanometer G. Then as the magnet oscillates,
	A coil having n turns and resistance R ? is connected with a galvanometer of resistance $4R\Omega $. This combination is moved in time t seconds from a magnetic field $W_1$ weber to $W_2$ weber. The induced current in the circuit is

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