PHYS208 Fundamentals of Physics II

November 15, 1993    Midterm Exam 2

Numerical Answers

to check your work...

1. a.

1. b.  In which direction will the electron circulate?

clockwise

1. c.  What circuit element would convert it into an ammeter that reads 3.0 mA full scale?

3.6 ohm resistor in parallel

2.

  capacitive branch inductive branch power supply
initial current (mA) 100 0 100
final current (mA) 0 500 500
time constant (microsec) 100 50 n/a
current (mA) after 50 microsec 60 320 380

3. b.  Given a solenoid of length 50 cm, diameter 10 cm, 250 turns, which carries a current of 5.0 A, evaluate the magnetic field.

3.14 mT

3. c.  If the current drops steadily to zero in 10 ms, what emf is induced in a single-turn loop (diameter 50 cm) outside the solenoid?

2.5 mV

4. c.  Now estimate the inductance per unit length.

0.64 mu0


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Last updated Nov. 9, 1997.
Copyright George Watson, Univ. of Delaware, 1997.