Q1: The polarity of induced voltage while a field is collapsing is:

A present only if the force is stationary

B opposite to the force creating it

C identical to the force creating the field

D independent of the force creating it

ANS:B - opposite to the force creating it

"However, when the switch is opened, the coil's inductance responds to the decrease in current by inducing a voltage of reverse polarity, in an effort to maintain current at the same magnitude and in the same direction."

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