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The answer to this question would be B (the battery is the electrical power supply)
Answer:
Part a)

Part b)

Explanation:
Part a)
Average angular acceleration is given as rate of change in angular speed
so it is given as



Part b)
average external torque is given as

here we know that



The right answer for the question that is being asked and shown above is that: "D) The magnetic north and south poles of Earth are interchanged." The statement that best describes an effect of changes in Earth's magnetic field is that D) The magnetic north and south poles of Earth are interchanged.<span>
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