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If it is now allowed to move, its motion produces, in virtue of the laws of induction, a current in the circuit of intensity, i1, in the opposite direction to the external current; the effective intensity of the current traversing the circuit is thus reduced to i i1. Here M1 C1 is a function of i i1, not of i.
The intensity of the current which traverses the circuit had the value, i, when the motor was at rest; by the working of the motor it is reduced to i i1.
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