Problem 8 (5 pts): Consider two silver wires, one wire has 3 times the length an

Question

Problem 8 (5 pts): Consider two silver wires, one wire has 3 times the length and half the radius of the other. How do the resistivities of these two wires compare? - - A) The longer wire has 4/3 times times the resistivity of the shorter wire. B) The longer wire has 3 times the resistivity of the shorter wire. Both wires have the same resistivity D) The longer wire has 3/4 times times the resistivity of the shorter wire. Problem 9 (5 pts): Consider the circuit shown in the figure. When the switch S is closed, how will the current passing through R () and the current passing through the battery (Ir) change? Ii will increase, Ir will increase. I will remain the same, Ir will increase. I will decrease, Ir will increase. I will decrease, Ir will decrease. I will remain the same, Ir will decrease. switch R1 Problem 10 (5 pts): A resistor and a capacitor are connected in series across an ideal battery having a constant voltage across its terminals. At the moment contact is made with the battery, the voltage across the resistor A)Jequal to the battery's terminal voltage less than the battery's terminal voltage, but greater than zero zero than the voltage across the capacitor Problem 11 (5 pts): Kirchhoff's junction rule is a statement of A) the law of conservation of momentum the law of conservation of energy the law of conservation of charge the law of conservation of angular momentum

Explanation / Answer

8. Resistivity is the property of material not the property that is related to dimensions.

Option C

9. Potential difference does not change across R1 , doesn’t matter switch is closed or not, so current through R1 (I1)will not change.. but equivalent resistance will get decreased so the current IT increases.

Option B

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