6. Cable A and cable B are made up of the same material and of the same length. The cross-section area of cable A is twice that of cable B. When the same electric potential difference is maintained across both cables, which of the following statement is TRUE? (A) Both cables carry the same current density. (B) The current density in cable B is twice as great as the current density in cable A. (C) The current density in cable A is twice as great as the current density in cable B. (D) Both cables carry the same current (E) The current in cable B is twice as great as the current in cable A.

8. A series RC circuit is connected across an ideal DC voltage source through an open switch. The switch is closed at time t = 0 sec. Which of the following statements regarding the circuit is correct? (A) The potential differences across the resistor and the capacitor are always equal. (B) The potential difference across the resistor is always greater than that across the capacitor. (C) The potential difference across the capacitor is always greater than that across the resistor. (D) Once the capacitor is essentially fully charged, the potential difference across the capacitor becomes zero. (E) Once the capacitor is essentially fully charged, the potential difference across the resistor becomes zero.

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