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

question 42

Multiple Choice

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?

• A) It must increase by 60%.
• B) It must increase by 120%.
• C) It must decrease by 40%.
• D) It must increase by 67%.

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