(Part C) A magnetic field of magnitude B = 75 mT points at an angle = 30° from t

Question

(Part C) A magnetic field of magnitude B = 75 mT points at an angle = 30° from the normal of a circular loop of radius R = 20 mm as shown below. The loop has N = 500 turns.

c. The radius of the coil is decreasing steadily with time; the magnetic field is held constant. What direction of current will be induced in the coil of wire? Carefully explain your answer!

c1. What is the direction of the original magnetic field with respect to the figure (left, right, up, down, into, out of)?

c2. How is magnetic flux changing (increasing or decreasing)?

c3. Faraday's Law says a voltage will be induced to (reinforce / oppose) the change in flux.

c4. What is the direction of the INDUCED magnetic field with respect to the figure (left, right, up, down, into, out of)?

c5. What is the direction of the induced current in the wire (CW or CCW)?

(Note: Only need to answer c1 - c5.)

Explanation / Answer

If the radius is decreasing, this means that the magnetic field is also decreasing. The direction of the current will be the same.
Therefore, the direction of the induced current will be counter-clockwise.

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