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A conductor wire having 10^29 free electrons / m^3 carries a current of 20A. If the cross-section of the wire is 1mm^2 , then the drift velocity of electrons will be :

For an element 'X' the process of oxidation is: X_(2)O_(4)^(-2) rarr New compound If 965 A current when passed for 100 seconds discharged 0.1 of X_(2)O_(4)^(-2) find oxidation state of X in new compound?

A circular loop of wire is in the same plane as an infinitely long wire carrying a consatnt current i . Four possible motions of the loop are marked by N.E.W and S as shown A clockwise current is induced in the loop when loop is pulled towards :

An AC source is connected to a capacitor. The current in the current is I. Now a dielectric slab is inserted into the capacitor , then the new current is

The ratio of the magnetic field at the centre of a current carrying circular coil to its magnetic moment is x. If the current and radius both are doubled the new ratio will become