Which of the following expressions gives the magnitude of the force on a straight…

MATHEMATICS · Single correct · A Level · Mathematics · Forces and Newton's laws · Forces and Newton's laws

Problem

Which of the following expressions gives the magnitude of the force

F

on a straight conductor of length

L

carrying current

I

in a magnetic field of strength

B

, when the conductor makes an angle

\theta

with the field? (a)

F = I L B \cos\theta

(b)

F = I L B

(c)

F = I L B \sin\theta

(d)

F = I L B \sin 2\theta