Current Electri...

Electromotive force of a battery represents

In a meter bridge, a standard resistor of R ohm is connected in the left gap and two wires A and B are connected one after the other in the right gap. The balancing length measured from the left is 50 cm for either of them. If the two wires are connected is series and put in the right gap, the balancing length measured from the left would be (in cm)

The resistivity of a wire varies with its

Which of the following quantities do not change when a resistor connected to a battery is heated due to the current?

As the temperature of a conductor increases, its resistivity and conductivity change. The ratio of resistivity to conductivity

Which of the following wiring diagrams could be experimentally determine $$R$$ using ohms law? Assume an ideal voltmeter and an ideal ammeter

The amount of work done by the cell on a unit positive charge carrier to force it to go to the point of higher potential is called

e.m.f. is measured in

The current in a wire is doubled keeping temperature constant. Which of the following statements is/are wrong?

In the absence of an electric field, the mean velocity of free electrons in a conductor at absolute temperature $$(T)$$ is