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Answer:
52) b.
When the current through a solenoid increases at a constant rate, the induced current also increase with time but in the opposite direction of the inducing current.
Solenoid is coil of wire used as electromagnet, whose purpose is to generate a controlled magnetic filed, it works on the Faraday's law of electromagnetic induction.
When we increase the current through a solenoid, the eddy current throughout the solenoid also increases, which induced a current in the opposite direction, as the amount of current increase, the rating of induced current will also increase in the same proportion.
Therefore, When the current through a solenoid increases at a constant rate, the induced current also increase with time but in the opposite direction of the inducing current.
53) b .
The standard voltage and frequency of alternating current (AC) electricity used in homes varies from country to country throughout the world. Typically, either 120-volt AC or 240-volt AC is used. Also, most countries use 50Hz (50 Hertz or 50 cycles per second) as the AC frequency.
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