A heavy current is passed throuhgh a wire , is it charged?

When current I is made to flow in a wire of radius r, the drift velocity is v_d . If the same current is passed through a wire of radius 2r, then drift velocity will be:

A mettalic wire is bent into a square of each side a. If a current I is passed through the wire, what is the magnetic field at the centre of the square?

A negligible small current is passed through a wire of length 15 m and uniform cross section 6.0 xx 10^-7 m^2 and its resistance is measured to be 5.0 Omega . What is the resistivity of the material?

An electric current is passed through a circuit containing two wires of the same material, connected in parallel. If the lengths and radii are in the ratio of 4/3 and 2/3, then the ratio of the current passing through the wires will be

Two identical wires one of Nichrome and other copper are connected in series and a current I is passed through them.State the change observed in the temperature of the 2 wires .Justify your answer .State the law which explains the above observation.

Nichrome and copper wires of same length and same radius are connected in series. Current I is passed through them. Which wire gets heated up more? Justify your answer.

A current is passed through a spring, then the spring will: