Discussion
Every indicating instrument requires a controlling torque so that
Answer: A
Correct answer: the deflection settles at a definite value for a given input
Without a controlling torque the pointer would swing to the end of the scale for any input at all, since nothing would oppose the deflecting torque. The controlling torque grows with deflection, so the pointer stops where the two balance - and it also returns the pointer to zero when the input is removed.
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