A potential difference of 200 V is maintained across a conductor of resistance 100 $$\Omega$$. The number of electrons passing through it in 1s is

In a dc circuit the direction of current inside the battery and outside the battery respectively are -

A car battery is charged by a 12 V supply, and energy stored in it is 7.20 $$\times$$ 10⁵ J. The charge passed through the battery is -

If n, e, $$\tau$$ and m have their usual meanings, then the resistance of a wire of length l and cross-sectional area A is given by -