A coil is placed in a magnetic field and has a flux FB 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?
a. It must increase by 60%.
c. It must decrease by 40%.
b. It must increase by 120%.
d. It must increase by 67%.
D
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