Three students are discussing a rectangular wire loop being pulled at constant s

Question

Three students are discussing a rectangular wire loop being pulled at constant speed in a region where there's a uniform magnetic field as shown above. Each makes a statement and only one is correct. Alicia: if a rectangular loop is pulled into a region where there is a uniform magnetic field, the rate of change in magnetic flux will increase as more of the loop is moved into the field. Banji: the rate of change of magnetic flux through the loop will be constant as the loop moves into the field because the speed of the loop is constant. Colin: No, the rate of change of magnetic field through the loop is zero since the loop is moving at constant speed. Which student is correct? Explain why.

Explanation / Answer

Alicia: if a rectangular loop is pulled into a region where there is a uniform magnetic field, the rate of change in magnetic flux will increase as more of the loop is moved into the field.

The induced magnetic field inside any loop of wire always acts to keep the magnetic flux in the loop constant

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