A 2 m wire carries 4 A perpendicular to a 0.4 T field. What magnetic force acts on it?

A) 1.6 N

B) 3.2 N

C) 4.8 N

D) 6.4 N

Answer: B

Explanation: Use magnetic force = field × current × length at 90° for the stated idealized conditions. Substitution gives 0.4 × 4 × 2 = 3.2 N.

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