A coil is placed in a magnetic field and has a flux $\varPsi$_B through it. The coil is stressed so that its area reduces to 60% of its original value. If the plane of the coil stays the same and the flux through it remains the same, how must the magnetic field change?

Question

Quizplus · Accepted Answer

The magnetic field must increase by 67% because the area of the coil is reduced to 60% of its original value, so the magnetic field must increase to compensate for the reduced area to keep the flux constant. The increase needed is calculated as (1/0.6) - 1 = 0.67 or 67%.

A Coil Is Placed in a Magnetic Field and Has Ψ\varPsiΨ

A Coil Is Placed in a Magnetic Field and Has $\varPsi$