Unless otherwise stated, friction and air resistance can be neglected m the foll

Question

Unless otherwise stated, friction and air resistance can be neglected m the following problems. Read the questions carefully and circle the best answer. Currents I_1 and I_2 are directed to the right, while I_3 and I_4 direct upward. In which region is the magnetic field guaranteed to be going into the page? A long straight wire has current I_1 directed out of the page. There is also a long straight wire with current I_2 directed to the right. What is the magnitude of the magnetic field at point P? Three long, straight wires are oriented perpendicular to the page and are carrying currents of equal magnitude in the directions indicated. In which direction is the net force on the rightmost wire?

Explanation / Answer

1.

By Ampere's Right Hand Rule

d is the answer

D) d

2.

D is the answer

Since current directions are opposite and from Biot Savart Law we calculate the magnitude

3.

D) LEFT

since the attractive force due to neighbour is greater than the repulsive force of the other ( as it is farther, F falls of s 1/distance^2)

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