Question

? 2R I R 2I X Questions 24-25 S 10 ? 30 V 20 ? 3.0 ?F 23. Three resistors are connected to an ideal battery, as shown in the figure above. The battery has an emf ? . Two of the resistors have known resistances R and 2R. The third resistor has unknown resistance X. The current in two of the branches is shown. What is the value of the unknown resistance X ? (A) R/5 (B) R/4 (C) R/2 (D) R (E) 2R An uncharged 3.0 ?F capacitor is placed in a circuit with an ideal battery, two resistors, and an open switch S, as shown in the figure above. The switch is then closed. 24. What is the current in the 10 ? resistor immediately after the switch is closed? (A) Zero (B) 1.0 A (C) 1.5 A (D) 3.0 A (E) 10 A 25. What is the current in the 20 ? resistor a long time after the switch is closed? (A) Zero (B) 1.0 A (C) 1.5 A (D) 3.0 A (E) 10 A

          ?
2R
I
R
2I
X
Questions 24-25
S 10 ?
30 V
20 ? 3.0 ?F
23. Three resistors are connected to an ideal battery,
as shown in the figure above. The battery has
an emf ? . Two of the resistors have known
resistances R and 2R. The third resistor has
unknown resistance X. The current in two of the
branches is shown. What is the value of the
unknown resistance X ?
(A) R/5
(B) R/4
(C) R/2
(D) R
(E) 2R
An uncharged 3.0 ?F capacitor is placed in a
circuit with an ideal battery, two resistors, and an
open switch S, as shown in the figure above. The
switch is then closed.
24. What is the current in the 10 ? resistor
immediately after the switch is closed?
(A) Zero
(B) 1.0 A
(C) 1.5 A
(D) 3.0 A
(E) 10 A
25. What is the current in the 20 ? resistor a long
time after the switch is closed?
(A) Zero
(B) 1.0 A
(C) 1.5 A
(D) 3.0 A
(E) 10 A

?
2R
I
R
2I
X
Questions 24-25
S 10 ?
30 V
20 ? 3.0 ?F
23. Three resistors are connected to an ideal battery,
as shown in the figure above. The battery has
an emf ? . Two of the resistors have known
resistances R and 2R. The third resistor has
unknown resistance X. The current in two of the
branches is shown. What is the value of the
unknown resistance X ?
(A) R/5
(B) R/4
(C) R/2
(D) R
(E) 2R
An uncharged 3.0 ?F capacitor is placed in a
circuit with an ideal battery, two resistors, and an
open switch S, as shown in the figure above. The
switch is then closed.
24. What is the current in the 10 ? resistor
immediately after the switch is closed?
(A) Zero
(B) 1.0 A
(C) 1.5 A
(D) 3.0 A
(E) 10 A
25. What is the current in the 20 ? resistor a long
time after the switch is closed?
(A) Zero
(B) 1.0 A
(C) 1.5 A
(D) 3.0 A
(E) 10 A

Added by Elizabeth P.

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