A straight wire of length 0.5 metre and carrying a current

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A straight wire of length 0.5 metre and carrying a current of 1.2 ampere is placed in uniform magnetic field of induction 2 tesla. The magnetic field is perpendicular to the length of the wire. The force on the wire is

1. 2.4 N
2. 1.2 N
3. 3.0 N
4. 2.0 N

Correct Option: B

F = Bi ℓ = 2 ×1.2 × 0.5 = 1.2 N