In a Demonstration,a 4

question 49

Multiple Choice

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 4 000 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.