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A Long Straight Wire on the Z-Axis Carries a Current

Question 31

Multiple Choice

A long straight wire on the z-axis carries a current of 6.0 A in the positive direction. A circular loop in the xy-plane, of radius 10 cm, carries a 1.0-A current, as shown in the figure. Point P, at the center of the loop, is 25 cm from the z-axis. An electron is projected from P with a velocity of 1.0 × 106 m/s in the negative x-direction. What is the y component of the force on the electron? (e = 1.60 × 10-19 C, μ0 = 4π × 10-7 T ∙ m/A) A long straight wire on the z-axis carries a current of 6.0 A in the positive direction. A circular loop in the xy-plane, of radius 10 cm, carries a 1.0-A current, as shown in the figure. Point P, at the center of the loop, is 25 cm from the z-axis. An electron is projected from P with a velocity of 1.0 × 10<sup>6</sup> m/s in the negative x-direction. What is the y component of the force on the electron? (e = 1.60 × 10<sup>-19</sup> C, μ0 = 4π × 10<sup>-7</sup> T ∙ m/A)    A)  -1.0 × 10<sup>-18</sup> N B)  +1.0 × 10<sup>-18 </sup>N C)  -2.0 × 10<sup>-18</sup> N D)  +2.0 × 10<sup>-18</sup> N E)  zero


A) -1.0 × 10-18 N
B) +1.0 × 10-18 N
C) -2.0 × 10-18 N
D) +2.0 × 10-18 N
E) zero

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