A. 1000J

B. 100J

C. 100 mJ

D. 1 mJ

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

Three unequal resistors in parallel are equivalent to a resistance 1 ohm. If two of them are in the ratio 1:2and if no resistance value is fractional the largest of the three resistances in ohms is

One junction of thermo couple is at 0^{0}C and the other junction is heated .Maximum current in the thermo couple is observed when hot junction is at 240^{0}C.The temperature of the hot junction at which the direction of current reverses is