A horizontal wire carries a current straight toward you. From your point of view

Question

A horizontal wire carries a current straight toward you. From your point of view, the magnetic field at a point directly below the wire points A) vertically upward B) to the right C) directly toward you D) directly away from you E) to the left The magnetic field at a distance of 2 cm from a current carrying wire is 4 mu T. What is the magnetic field at a distance of 4 cm from the wire? A) 4 mu T B) 1/2 mu T C) 1 mu T D) 8 mu T E) 2 mu T The figure shoves three long, parallel current-carrying wires. The magnitudes of the currents are equal and their directions are indicated in the figure. Which of the arrows drawn near the wire carrying current 1 correctly indicates the direction of the magnetic force acting on that wire? A) A B) B C) C D) D A very long straight wire carries a 12-A current eastward and a second very long straight wire carries a 14-A current westward. The wires are parallel to each other and are 42 cm apart. Calculate the force on a 6.4 m length of one of the wires (mu_0 = 4 pi times 10^-7 T middot m/A) A) 8.0 times 10^-5 N B) 5.1 times 10^-6 N C) 2.7 times 10^-4 N D) 8.0 times 10^-7 N A) 5.1 times 10^-4 N A negatively charged particle is moving to the right, directly above a wire having a current flowing to the right, as shown in the figure. In which direction is the magnetic force exerted on the particle? A) into the page B) downward C) upward D) out of the page Three particles travel through a region of space where the magnetic field is out of the page, as shown in the figure. The electric charge each of the three particles respectively. A) 1 is neutral, 2 is positive, and 3 is negative. B) 1 is positive, 2 is neutral, and 3 is negative. C) 1 is positive, 2 is negative, and 3 is neutral. D) 1 is neutral, 2 is negative, and 3 is positive. E) 1 is negative, 2 is neutral, and 3 is positive.

Explanation / Answer

here,

21)

the direction of current in the wire is straight towards me

than

using right hand thumb rule

the direction of magnetic feild at a point directly below the wire points B)to the right

22)

at x1 = 0.02 m , B1 = 4 uT

let magnetic feild be B2 at x2 = 0.04 m

magnetic feild , B1 = u0 * I /( 2 * pi * x1)

I = B1 * 2 * pi * x1 /u0 ...(1)

so,

B1 * 2 * pi * x1 /u0 = B2 * 2 * pi * x2 /u0

B1 * x1 = B2 * x2

0.02 * 4 uT = B2 * 0.04

B2 = 2 uT

the correct option is E) 2 uT

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