A steady current is set up in a metallic wire of non-uniform cross-section. Then the drift velocity related the area of cross-section (A) as

Thomson coefficient of a conductor is 10μV/K.The two ends of it are kept at 50⁰C and 60⁰C respectively.Amount of heat absorbed by the conductor when a charge of 10C flows through it is

A 25 watt,220 volt bulb and a 100 watt,220 volt bulb are connected in series across 440 volt line

A voltameter has internal resistance r ohms and range V volts.The value of resistance used in series to convert it into a voltmeter of range 4V volts is

In Potentiometer experiment,the balancing length with a cell in the secondary circuit is found to be 480cm.when a resistor of 8 ohm is connected in parallel to the cell the balancing length is found to be 420cm.The internal resistance of the cell is