1. A straight conductor 10 cm long is perpendicular to a uniform magnetic field

Question

1.

A straight conductor 10 cm long is perpendicular to a uniform magnetic field of flux density 2.0 mT. When the conductor carries a current of 5.0 A, the force exerted on it by the field is

A) 0.25 kN     B) 40 mN     C) 1.0 mN     D) zero     E) 5.0 mN

Ans:

1.

A straight conductor 10 cm long is perpendicular to a uniform magnetic field of flux density 2.0 mT. When the conductor carries a current of 5.0 A, the force exerted on it by the field is

A) 0.25 kN     B) 40 mN     C) 1.0 mN     D) zero     E) 5.0 mN

Ans:

Explanation / Answer

F = ILB

I = 5 A , l = 10 cm = 0;1 m., B = 2x 106-3 T

F = 5 ( 10x 10^2) (2 x 10^-3) = 10^-3 N = 1 mN

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