GOALS

Physics

• Measure magnetic field strength and find F vs. I for a current carrying conductor in a magnetic field.
• Use both Faraday's law with a flip-coil and the magnetic force law with current balance to determine the magnetic field strength.

Technique

• Gain some experience with the basic RC integration circuit.
• Use the oscilloscope as a charge indicator at slow sweep speeds.
• Graph F vs. I to check "linearity" and determine the value of B.

Errors

• Predict uncertainty in measurement of B by the two methods and check whether they agree.

Question (Work out in lab book before coming to class)

If the flip-coil has 100 turns and a 4 cm² area , how much charge can be stored on the capacitor of Fig. 2 for a magnetic field of 0.5 tesla and resistance of 10⁶ ? What voltage is this on a 2 F capacitor?

References

• Halliday and Resnick, 3rd Ed, Ch. 30-7; 31-2, 3; 32-3; 34-8
• Young, University Physics, 8th Ed., Ch. 28, 29, 30