Answer as many as you can to get all the points Suppose you have an arrangement

Question

Answer as many as you can to get all the points

Suppose you have an arrangement of four wires, carrying current perpendicular to the plane of the paper, and at the corners of a square. Two of the wires carry current into the page, and two carry current out of the page, with values as shown. Which arrow best represents the direction of the magnetic field at the center of the square, due to these currents? What is the approximate direction of the magnetic force on wire 4, due to the other three wires?

Explanation / Answer

Number 1)

All fields will cancel. The field is zero at the center. Choice E

Number 2)

By the right hand rules, and the values of the currents, it will be mostly toward the bottom of the page. Choice C

Number 3)

By the right hand rule, Choice D

Number 4)

It must be closer to wire B since the current is smaller. Choice C

Number 5)

F = uIIL/2pir

F = (4pi X 10-7)(10)(5)(1)/(2pi)(.15)

F = 6.7 X 10-5 N Toward Wire B since the currents are in the same direction

Choice C

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