In circular coil, when no. of turns is doubled and resistance becomes `(1)/(4)th` of initial, then inductance becomes

When the diameter of a wire is doubled, its resistance becomes:

If a wire of resistacne R is fold n times so that its length becomes ((1)/(n )) ^(th) of its initial length, then its new resistance becomes

When the number of turns in a coil is doubled without any change in the length of the coil, its self-inductance becomes

When the number of turns in a coil is doubled without any change in the length of the coil, its self-inductance becomes

When the number of turns in a coil is doubled without any change in the length of coil its selfinductance becomes ________ .