The basic principle of working of motors is

Electromagnetic Induction

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Force on current carrying conductor.

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Electrostatic Force

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Heating effect of electric current

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Solution

The correct option is B Force on current carrying conductor.
When current is passed through the armature of an electric motor placed in an external magnetic field, it experiences forces along the arms and hence experiences a net torque. The torque causes a constant rotation of the armature.

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DC motor works on the principle of ___ on a current carrying conductor due to magnetic field.

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