Expert answers to "In what direction would the net force be..."

Linda Peters

Answered question

2022-09-25

In what direction would the net force be if the bar magnet were turned around, or the current in the loop reversed? What can you say about the net force if the field were uniform

(θ = 0)

Answer & Explanation

Kelbelol

Beginner2022-09-26Added 10 answers

Each segment of the loop experiences a magnetic force and the net force is given by

F_{n e t} = I B \sin θ \int d l

...(1)
We integrate over the radius of the loop and equation (1) after integration will be

F_{n e t} = I B (2 π R) \sin θ

...(2)
The net force depends on the current on the loop as shown by equation (2), therefore, the current reversed when the magnet bar is reversed. Hence, the net force is reversed
If the field were uniform at

θ = 0

, the net force will be zero as sin 0 = 0
Result:
The net force reversed as the current reversed and equals zero at

θ = 0

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