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12 Questions of Electricity and Magnetism

(See attached file for full problem description with diagrams)

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a) Find the equivalent resistance of the circuit.

b) Find the current through the battery.

c) Find the voltage across the 800 ohm resistor.

c) Find the current in the 560 ohm resistor.

d) Find the voltage across the 400 ohm resistor.

Four identical light bulbs are connected to a voltage source as shown below.

a) Rank the light bulbs by brightness, from brightest to dimmest.
If any have the same brightness, explicitly say so.

Suppose Bulb B is unscrewed from its socket.

b) Does the current through the battery increase, decrease, or remain the same? Justify your answer.

c) Does bulb A get brighter, dimmer or remain the same? Explain.

d) Does bulb C get brighter, dimmer or remain the same? Explain.

Two wires carry currents as shown below.

a) What is the direction of the magnetic field due to the 5A wire at point P? (Draw an arrow in the space below to indicate the direction or indicate that it is into or out of the page).

b) What is the direction of the magnetic field due to the 15 A wire at point P? (Draw an arrow in the space below to indicate the direction or indicate that it is into or out of the page).
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Solution Summary

good conceptual questions.

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