A. A is false but R is true
B. A is true but R is false
C. Both A & R true and R is not a correct explanation of A
D. Both A & R are true and R is the correct explanation of A
S.I unit of electrical conductivity
Thomson coefficient of a conductor is 10μVK. The two ends of it are kept at 50<sup>0 </sup>C and 60<sup>0</sup> 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
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 00C and the other junction is heated .Maximum current in the thermo couple is observed when hot junction is at 2400C.The temperature of the hot junction at which the direction of current reverses is