Resistances are connected in the two gaps of a meter bridge.The balance point is 20cm from the zero end.When a 15Ω resistor is connected in series with the smaller resistance then the null point shifts to 40cm.the smaller resistance is

If in a Wheatstone bridge the battery and Galvanometer are interchanged, the condition for balance

(A): bending of a conducting wire effects electrical resistance

(R): Resistance of a wire depends on resistivity of that material

S.I unit of electrical conductivity

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

When a high resistance R is connected in series with a voltmeter of resistance G, the range of the voltmeter increases 5 times. Then G:R will be

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