Discussion
An electrodynamometer instrument differs from a moving coil one in having
Answer: B
Correct answer: fixed coils in place of the permanent magnet
Both the field and the moving coil carry the current, so the torque is proportional to the product of the two - that is, to the square of the current if they are in series. Reversing the current reverses both fields, so the deflection is unchanged, which is what allows the instrument to read alternating quantities and to measure power.
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