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# Force on a coil of wire difficult question Watch

For the above paper the answer is c to question 5 but why?
2. I expect you forgot there were fifty turns. So you need F=BIL for one length QS and then times fifty. The angle is irrelevant to side QS

0.2 x 3 x 0.04 x 50 =1.2 N
3. (Original post by nerak99)
I expect you forgot there were fifty turns. So you need F=BIL for one length QS and then times fifty. The angle is irrelevant to side QS

0.2 x 3 x 0.04 x 50 =1.2 N
why is the angle irrelevant
4. Because the wire as is vertical. The angle would be relevant to current in the horizontal sections of the coil.
5. (Original post by nerak99)
Because the wire as is vertical. The angle would be relevant to current in the horizontal sections of the coil.
thank you

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