on your HW book. Staple all papers together and hand in to your TA in recitation
ID: 2035817 • Letter: O
Question
on your HW book. Staple all papers together and hand in to your TA in recitation. 1: Figure shows two coils; coil A and coil B. Coil A will generate magnetic field that coil B will see. Using Lenz's law, determine the direction of the current is resistor ab R when a. switch S is closed; b. switch S is opened after having been closed for several minutes; c. coil B is brought closer to coil A with the switch S closed; d. the resistance R is decreased while the switch S remains closed. 2: A conducting rod of length L 30.0 cm moves in a magnetic field of magnitude 0.450 T directed into the plane as shown in the figure. The rod moves with the speed the direction shown. a. What is the induced voltage (emf e) across the ends of the rod? b. Which point, a or b, is at higher potential? c. When the charges in the rod are in equilibrium (due to an 5.00 m/s in electric field generated by the + and - ends of the rod), what are the magnitude and the direction of electric field within the rod? 3: Magnets and Magnetic Fields HW question 1 and Lenz's Law question 1 (page 117 and 121)Explanation / Answer
1-
B induces current which produces magnetic field in the opposite direction as A
so induced current is b to a.
2
as the switch is opened , magnetic flux linked with B decreases as the current in A decreases. To oppose the decrease in the magnetic flux, B induces current which produces magnetic field in the same direction as A
so induced current is a to b.
C.
As coil B is moved towards A , magnetic flux through B increases. to oppose the increase , B induces current which produces magnetic field in the opposite direction as A
so induced current is b to a.
D
as resistance in A is decreased, the value of current in A will increase which will increase the magnetic flux in B , to oppose the increase , B induces current which produces magnetic field in the opposite direction as A
so induced current is b to a.
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