multi-turn coil

A generalization of the above current loop is a multi-turn coil, or solenoid.

For multi-turn coils, the resonant frequency is lower because of capacitance between the turns.

An increased amplitude of the e.m.f. may be achieved by using a multi-turn coil.

Although feeding current to a multi-turn coil armature might not require currents as large as those required in a railgun, the elimination of the need for high speed sliding contacts is an obvious potential advantage of the induction coilgun relative to the railgun.