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  4. A certain electric motor wires that carry a current of 5 A are perpendicular to a magnetic field of 0.8 tesla. The force on each cm of wire is:

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Q. A certain electric motor wires that carry a current of 5 A are perpendicular to a magnetic field of 0.8 tesla. The force on each cm of wire is:

JIPMERJIPMER 1995

Solution:

$F = Bil =0.8 \times 5 \times 20 \times 10^{-2}=0.8 N$