Two circular loops of wire lie on either side of a long straight wire. The curre

Question

Two circular loops of wire lie on either side of a long straight wire. The current in the straight wire is downward and increasing. The directions of the induced currents in the circular loops are best described as: A. Left - Counterclockwise; Right - Clockwise B. Right - Counterclockwise; Left - Clockwise C. Both loops clockwise D. No current in either loop E. Both loops counterclockwise The terminals of a 12.0 V battery are connected by a copper wire (resistivity 1.68 times 10^-8 Ohm middot m) and cross-sectional area 2.00 times 10^-5 m^2. If the power dissipated is 1.40 times 10^3 W, the length of the wire is closest to: A. 345 m B. 234 m C. 122 m D. 456 m E. 567 m

Explanation / Answer

Lenz's law states that the current induced in a circuit due to a change or a motion in a magnetic field is so directed as to oppose the change in flux and to exert a mechanical force opposing the motion.

12) correct option is A

13)V = 12 V, p = 1.68*10^-8 ohm.m

A = 2*10^-5 m^2, P = 1.4*10^3 W

P = V^2/R

1.4*10^3 = 12*12/R

R = 0.10286 ohms

R = pL/A

0.10286 = 1.68*10^-8*L/(2*10^-5)

L = 122 m

correct option is (C)

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