An inductor L of reactance XL is connected in series with a bulb B to an A.C. source as shown in the figure. Briefly explain, how does the brightness of the bulb change when
(a) Number of turns of the inductor is reduced and
(b) A capacitor of reactance X_C =X_L is included in series in the same circuit.

A coil A is connected to voltmeter V and the other coil B to an alternating current source D. If a large copper sheet CC is placed between the two coils, how does the induced e.m.f in the coil A change due to current in coil B?

The axes of two magnets are collinear. One has poles of strength 80 Am separated by 125 mm, and the second has a magnetic moment of 12 A-m² with poles of strength 160 Am. Find the attractive force between the magnets if the north pole of one is 45 mm from the south pole of the second

In the following figure, the rectangular loop of wire is being pulled to the right, away from the long straight wire through which a steady current I flows upward as shown. Does the current induced in the loop flow in the clockwise sense or in the counter-clockwise sense? Justify.

Consider a magnet surrounded by a wire with an ON/OFF switch in the figure. If the switch is thrown from the OFF position (open circuit) to the ON position (closed circuit), will a current flow in the circuit? Explain.

The magnetic flux linked with a uniform surface area A in a uniform magnetic field is given by \(\phi \) = B.A = BA cos \(\theta \) .So flux linked will change, only when either B or A or the angle between B and A change.