PHYS 2426 SLO

SLO PHYS 2426 Part 1 Theoretical Problems 1. The potential difference across the ends of a wire is doubled in magnitude. If Ohm’s law is obeyed, which one of the following statements concerning the resistance of the wire is true? (a) The resistance is one-half of its original value. (b) The resistance is twice its original value. (c) The resistance is not changed. (d) The resistance increases by a factor of four. (e) The resistance decreases by a factor of four. 2. Which one of the following circuits has the largest resistance? 3. A physics student performed an experiment in which the potential difference V between the ends of a long straight wire was varied. The current I in the wire was measured at each value of the potential difference with an ammeter, and the experiment results are shown in the table. Trial V (volts) I (amperes) 1 5.0 0.25 2 10.0 0.50 3 15.0 0.75 4 20.0 1.00 5 25.0 1.50 6 30.0 1.65 7 35.0 1.55 8 40.0 1.53 Which one of the following statements is the best conclusion based on the data? (a) The resistance of the wire is 20 ohms (b) The wire obeys Ohm's law over the range of potential differences between 5 and 20 V. (c) The wire does not obey Ohm's law on the entire range of potentials. (d) The current in the wire is directly proportional to the applied potential difference. (e) The wire obeys Ohm's law over the range of potential differences between 5 and 30 V. 4. Will the resistance of a device change if the current in the device increases? a) Yes b) No

Part 2 Experimental Design You will use the following simulation: https://phet.colorado.edu/en/simulations/faradays-law Design a lab to determine if the number of coils in a solenoid affects the magnitude of induced electromotive force. In the design: a) Provide a general diagram. b) Write algebraically the relation that you are about to test. c) List the equipment that you suggest using. d) List the measuring devices and quantities you will measure, including scientific units. e) Explain the lab conduct. f) Provide numerical values that you measured and used to support your investigations. Explain the result.

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