In a demonstration, a 4.00 cm2 square coil with 10,000 turns enters a larger square region with a uniform 1.50-T magnetic field at a speed of 100 m/s. The plane of the coil is perpendicular to the field lines. If the breakdown voltage of air is 4000 V/cm on that day, the largest gap you can have between the two wires connected to the ends of the coil and still get a spark is
A. 7.5 × 10?3 cm.
B. 0.015 cm.
C. 7.5 cm.
D. 13 cm.
E. 15 cm.
Answer: C
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