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In a coil, the current increases from 0 to 6 A in 0.4 s. If an induced of e.m.f of 15V is produced in the coil, then the coeffiecient of self-induction of the coil will be

A house is fitted with seven tubelights of rating 220 V, 40 W each , two bulbs of rating 220 V, 60 W each, five fans each drawing a current of 0.4 at 220 V , and a heater of resistance 48.4 Omega . The main line power supplied to the house is at 220 V . Calculate the bill for the month of january if tubelights and bulbs are used for 6 h daily, fans for 1 h daily , and heater for 10 h daily. The electricity is to cost Rs. 2 per unit.

The figure shows three situations in which identical circular conducting loops are in uniform magnetic fields that are either increasing (Inc) or decreasing (Dec) in magnitude at identical rates. In each, the dashed line coincides with a diameter. Rank the situations according to the magnitude of the current induced in the loops, greatest first.

A galvanometer coil has a resistance of 15Omega and the meter shows full scale deflection for a current of 4mA . How will you convert the meter into an ammeter of range 0 to 6A?

A galvanometer coil has a resistance of 15 Omega and the metre shows full scale deflection for a current of 4 mA. To convert the meter into a voltmeter of range 0 to 18 V, the required resistance is

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A new flashlight cell of e.m.f. 1.5 volts given a current of 15 amps. When connected directly to an ammeter of resistance 0.04 Omega . The internal resistance of cell is