Questions in Current Electricity

Select	Question
	A $4\mu F$ conductor is charged to 400 volts and then its plates are joined through a resistance of $1\,k\Omega $. The heat produced in the resistance is
	A 10 ohm electric heater operates on a 110 V line. Calculate the rate at which it develops heat in watts
	A (100 W, 200 V) bulb is connected to a 160 V power supply. The power consumption would be
	A battery of e.m.f. 10 V and internal resistance 0.5 ohm is connected across a variable resistance R. The value of R for which the power delivered in it is maximum is given by
	A piece of fuse wire melts when a current of 15 ampere flows through it. With this current, if it dissipates 22.5 W, the resistance of fuse wire will be
	Two wires ‘A’ and ‘B’ of the same material have their lengths in the ratio 1 : 2 and radii in the ratio 2 : 1. The two wires are connected in parallel across a battery. The ratio of the heat produced in ‘A’ to the heat produced in ‘B’ for the same time is
	A heater draws a current of 2A when connected to a 250V source. The rate of energy dissipation is
	A bulb rated at (100W – 200V) is used on a 100V line. The current in the bulb is
	A steel wire has a resistance twice that of an aluminium wire. Both of them are connected with a constant voltage supply. More heat will be dissipated in
	A current i passes through a wire of length l, radius of cross-section r and resistivity $\rho$. The rate of heat generation is