University of California, San Diego
Physics 1b - Thermal Physics & Electromagnetism
||Physics 1B - Tutorial #9
- The figure above shows two long current-carrying wires. What is the
value of the magnetic field at point P, 1m away from the crossing
point? What would be the value of the magnetic field if one of the
currents were reversed?
- The figure (Hecht p. 820, q. 4) shows an electric door bell. The circuit
consists of a
battery, a switch at the door, a "make-break" contact and an electromagnet.
Explain what happens when the switch is pressed. Is this a "ding-dong"
chime, a buzzer, or what?
- The figure shows several different loops in magnetic fields. In
each case the magnetic field is perpendicular to the plane of the loop
and the field strength is indicated/ The numbers by the sides of the
loops indicate the lengths of the sides. Order the loops in order of
magnetic flux, from smallest to largest.
- A circular conducting loop rotates at constant angular speed about
an axle through the center of the loop. The figure shows an edge-on
view and defines an angle which increases from 0 to 360° as the
- At what angle(s) is the magnetic flux a maximum?
- At what angle(s) is the magnetic flux a minimum?
- At what angle(s) is the magnetic flux changing most rapidly?
- At what angle(s) is the induced emf a maximum?
Physics 1B Home
<!- hhmts start ->Last
modified: Tues., 16 May 2000 <!- hhmts end ->