Discussion
The reason a shunt magnet is highly inductive while a wattmeter's pressure coil is deliberately made nearly resistive is that
Answer: D
The wattmeter multiplies two currents directly, so its pressure coil current must be in phase with the voltage. The meter multiplies two fluxes through a sine, so it needs one of them in quadrature with the voltage. The requirements are opposite for the same reason: to obtain the cosine.
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