A spark can jump between two nontouching conductors if the potential difference

Question

A spark can jump between two nontouching conductors if the potential difference between them is sufficiently large. A potential difference of approximately 940 V is required to produce a spark in an air gap of 1.0 x 10-4 m. Suppose the light bulb in the figure is replaced by such a gap. How fast would a 4.53-m rod have to be moving in a magnetic field of 5.18 T to cause a spark to jump across the gap?

Explanation / Answer

EMF induced due to the moving rod V = B*l*v (By defintion) => 940 = 5.18 * 4.53 * v => v = 40.059 m/s Hope you liked my awesome short and detailed technique! :)

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