When lightning strikes, nearby magnetic compass needles are seen to jerk in resp

Question

When lightning strikes, nearby magnetic compass needles are seen to jerk in response to the electrical 1. discharge. No compass needle jerks however during the accumulation of electrostatic charge preceding the lightning bol, only when the bolt actually strikes. Based on this knowledge. please mark the following as true or false. The presence of an electric current produces a magnetic field TrueFalse The presence of a potential difference produces a magnetic field True False 2. Use the RHR-2 to draw the magnetic field in the pictures below. The longer bar indicates the positive side of the voltage source. wire coil 0

Explanation / Answer

According to the given problem,

1.)

a) Ans:True

Reason: The needle only deflects during the lightning not the charge build up because a lightning strike is like a complete circuit. The charge flows when the lightning strikes. This flowing charge creates magnetic effect and the needle deflects.

b) Ans: Flase

Reason:The presence of an electric current will produce a magnetic field, but the mere presence of a voltage will not.

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