Current Electri...

When a piece of aluminum wire of finite length is drawn through a series of dies to reduce its diameter to half its original value, its resistance will become

A wire 100 cm long and 2.0 mm diameter has a resistance of 0.7 ohm, the electrical resistivity of thematerial 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^–10m . 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?

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 end faces

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)

In the absence of applied potential, the electric current flowing through a metallic wire is zero because

Dimensions of a block are 1 cm × 1 cm × 100 cm. If specific resistance of its material is 3 × 10^–7ohm–m, then the resistance between the opposite rectangular faces is