Lenz\' and Faraday\'s Law Worksheet Group name Date: A. Review . Magnetic Forces

Question

Lenz' and Faraday's Law Worksheet Group name Date: A. Review . Magnetic Forces: Direction of B inside the loop a. Magnetic force on moving charges b. Magnetic force on electric current Right hand rule for the direction force is shown in the diagram to the right. 3. Magnetic Flux b. If B and A point in the same direction, the flux is positive. c. If B and A point in opposite directions, the flux is negative 4. Lenz's Law a. The flux due to the loop always opposes the change in the flux due to the external magnetic field. s. Faraday's Law a. A change in magnetic flux produces an eim B. Induced Currents . A copper loop is placed in a uniform magnetic field as shown on the right. Determine whether there would be a current through the wire in each case below and explain your answer. a. Stationary Loop b. Loop moves to the right eLoop moves to the left 2. The loop is now placed in a magnetic field produced by a solenoid, shown to the right. Repeat the questions in 1 for this new scenario. c. Lenz' law . Now we place the copper ring in a magnetic field as in Bl If the magnitude of the magnetic field decreases with time. 2. Would there be a current in the loop? If so, what would be its direction?

Explanation / Answer

1.

a. Zero

b. Zero

c. Zero

As the magnetic field is uniform, so no current would be induced in any of the above cases.

2.

a. Zero

b. Clockwise

c. Anti-clockwise

The current will be induced in the moving loops as the magnetic field is not uniform and is increasing from left to right. We can determine these directions using Faraday's right hand rule.

c.

1. In this case there is rate of change of flux, hence there would be emf induced on the loop.

2. Current would be in clockwise direction, i.e. opposite to the change produced.

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