California State University, Northridge » Physics » Physics 100B - General Physics II » Spring 2022

Physics 100B - General Physics II » Spring 2022 » Quiz 3

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Question #1

When a resistor with resistance R is connected to a battery with voltage V, a current of I is measured. If the battery is replaced so that the voltage is double the original, what will be the current through the resistor?

A. I

B. 4I

C. I/2

D. I/4

E. 2I

Question #2

A parallel-plate capacitor is first charged by a battery to steady state and then disconnected from the battery. The separation distance of the plates is then increased. What happens to the charge on the plates?

A. The charge increases.

B. The charge decreases.

C. The charges remains the same.

D. More information is needed.

Question #3

A small LED light buib is rated to use 3.3 W of power when connected to a 8 V battery. What is the resistance of the lightbulb?

A. 2.4 Ω

B. 19 Ω

C. 26 Ω

D. 5.2×10−2 Ω

E. 0.41 Ω

Question #4

You find a speaker wire on sale at Etsy. The wire is made of silver (ρ = 1.59×10−7 Ω⋅m ), has a diameter of 0.6 mm and is 2.3 m long. What is the resistance of this wire?

A. 6.1×10−4 Ω

B. 0.32 Ω

C. 1.3 Ω

D. 2.8×10−7 m2

E. 2.0×10−14 Ω

Question #5

While a capacitor is connected to a battery, a piece of glass is removed from the capacitor. What happens to the energy stored in the capacitor?

A. The energy decreases because the capacitance increases.

B. The energy decreases because the capacitance decreases.

C. The energy increases because the capacitance increases.

D. The energy increases because the capacitance decreases.

E. The energy does not change because the capacitance does not change.

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