A student builds a d.c. motor using a coil with 50 turns placed in a magnetic field of flux density 0.04 T. The coil carries a current of 2.0 A and each side of the coil has a length of 0.05 m in the magnetic field. What is the force on one side of the coil?

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Question

A student builds a d.c. motor using a coil with 50 turns placed in a magnetic field of flux density 0.04 T. The coil carries a current of 2.0 A and each side of the coil has a length of 0.05 m in the magnetic field. What is the force on one side of the coil?

Accepted Answer

0.20 N — 20 N). Award 1 mark for correct calculation: F = BIL × n = 0.04 × 2.0 × 0.05 × 50 = 0.20 N. A is incorrect — this omits the number of turns. C is incorrect — this uses incorrect multiplication. D is incorrect — this involves a calculation error with powers of ten.

Answer

0.20 N

Answer

0.004 N

Answer

200 N

Answer

4.0 N

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