Figure shows a current carrying coil placed in the magnetic field of permanent magnet. Magnetic field strength at the position of coil is 1T, the coil has 100 turns of radius and the current is 1A. What is force on the coil in N?

Engineering

Physics

Magnetic Field

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Question

Figure shows a current carrying coil placed in the magnetic field of permanent magnet. Magnetic field strength at the position of coil is 1T, the coil has 100 turns of radius $(\frac{4}{π}) cm$ and the current is 1A. What is force on the coil in N?

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F = iℓB
= i (2πrN)B
$= (1) (2 π) (\frac{4 \times 10^{- 2}}{π}) \times (100) \times 1 T = 8 N$