Current Electri...

A wire 100 cm long and 2.0 mm diameter has a resistance of 0.7 ohm, the electrical resistivityof the material is

A certain wire has a resistance R. The resistance of another wire identical with the first except having twice its diameter is

In hydrogen atom, the electron makes 6.6 × 10¹⁵revolutions per second around the nucleus in an orbit of radius 0.5 × 10^–10 m . It is equivalent to a current nearly

A wire of length 5 m and radius 1 mm has a resistance of 1 ohm. What length of the wire of the same material at the same temperature and of radius 2 mm will also have a resistance of 1 ohm

Metals have

Consider a rectangular slab of length L and area of cross-section A. A current I is passed through it. If the length is doubled, the potential drop across the endfaces

A wire of resistance R is elongated n-fold to make a new uniform wire. The resistance of new wire

A metallic block has no potential difference applied across it, then the mean velocity of free electrons is (T = absolute temperature of the block)

The drift velocity of the electrons in a copper wire of length 2 m under the application of a potential difference of 200 V is 0.5 ms^–1. Their mobility is(in m²V^–1s^–1)

The resistance of a metal increases withincreasing temperature because