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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 A 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.

A moving coil galvanometer has a circular coil of area 16 cm^(2) and 30 turns. It is mounted on a torsional spring of spring constant 100 Nm/rad. The coil turns by angle 21^(@) when a current 40 mA is passed through it. The magnitude of the uniform magnetic field produced by the permanent magnet inside the galvanometer is _________________T. [use cos 21^(@)=15/16, 21^(@)~~11/30 rad]

The internal resistance of a 2.1 V cell which gives a current of 0.2A through a resistance of 10 Omega is

The internal resistance of a 2.1 V cell which gives a current 0.2 A through a resistance of 10 Omega

A 0.21 H inductor and a 12 ohm resistance are connected in series to a 220 V . 50 Hz ac source. Calculate the current in the circuit and the phase angle between the current and the source voltage.