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ID: 2190489 • Letter: #
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A copper wire loop is constructed so that its radius,r, can change. It is held near a solenoid that has a constant current through it. a) Suppose that the radius of the loop were increasing. Use Lenz's law to explain why there would be an induced current through the wire. Indicate the direction of that current. b) Determine the direction of the induced current in two ways. Explain your reasoning for BOTH 1) Using Lenz's Law 2) Considering the magnetic force that is exerted on the charge in the wire of the loop c) find the direction of the magnetic moment of the loop d) find the direction of the force exerted on the loop by the solenoid. (B-field lines run from the left to right through both the loop and solenoid)Explanation / Answer
the area of ring is increasing but there is same magnetic field; so flux is decreasing ...so there will be current.. magnetic field is decreasing toward right..so to compensate that loss, it should give magnetic field to right so the current direction is in anti-clock wise direction
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