University of California, San Diego
Physics 1b - Thermal Physics & Electromagnetism
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Physics 1B - Tutorial #10
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- The figure above shows two coils, A & B. Use Lenz' Law to determine
which direction current flows through the resistor when
- (a) the switch is closed.
- (b) the switch is opened after being closed.
- (c) the current in A decreases.
- (d) the current in A increases.
- (e) B is moved toward A.
- The conducting loop shown above has area A = 0.01m2 and is
moving with v=1m/s into a magnetic field B = 10-4T. Graph the
current in the loop as a function of time.
- An apartment complex is supplied by single-phase AC from a power plant
5-km away. The wire that runs from the power plant to the complex and back
has a resistance per unit length of 1 x 10-5
/m, supplying 100,000W.
- Calculate the resistive power losses in the wire if the AC is supplied
at 110V.
- Calculate the resistive power losses in the wire if the AC is supplied
at 500kV.
- Design a way to transform AC provided at 500kV to 110V.

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Gene Smith
Last
modified: Tues., 6 June 2000