What will happen to an armature in an uniform magnetic field when it surface area is increased by increasing the number of turns

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Solution

Dear Student,
On increasing the surface area by increasing the number of turns the flux would increase across the armature (Φ = B A cosÏ´).
Thus, an EMF would be induced, according to Lenz Law, which will give rise to a current that would oppose the change of flux due to an increase in the number of turns.

Regards.

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