Ing to the point where the wire would break due to the electric current flowing

Question

Ing to the point where the wire would break due to the electric current flowing through it. To prevent this from happening what did she do? A. Replaced it with another copper wire with length L and diameter 2D. B. Replaced it with another copper wire with length 2 Land diameter D. C. Replaced it with another copper wire with length Land diameter D. D. Replaced it with another copper wire with length 4L and diameter 2D. 13. The diagram on the right shows an arrangement of four 5 ohm resistors. What is the equivalent resistance between points A and B? a. 25/3 Ohm B. 20 ohm C, 39 ohm D. 20/3 ohm 14. In the circuit shown, I_1 = 1.0 A, I_2 = 4.0 A. R_1 = 2.0 ohm, R_3 = 3.0 ohm, and R_4 = 2.0 ohm. Assuming the EMF has negligible internal resistance. what are epsilon and the current I through R_2? A. Epsilon = 20V, I = 3.0 A B. Epsilon =- 22V, I = 2.0 A c. Epsilon = 12v, I = 4.0 A D. Epsilon = 22V, I = 3.0 A

Explanation / Answer

here,

13)

R = 5 ohm

2 R and R are in parallel, let their equivalent resistance be R1

R1 = 2 * R * R /( 2 * R + R)

R1 = 0.67 * R

the equivalent resistance of the circuit , Req = R + R1

Req = 0.67 * R + R

Req = 1.67 * 5 = 8.35 ohm = 25/3 ohm

the answer is A) 25/3 ohm

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