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## Homework Statement

## Homework Equations

T = IAB sin θ ; θ is the angle between B and I.

T = μ × B

## The Attempt at a Solution

A) T = IAB sin θ

T = √2 a b I B (θ = 45°)

B) T = 0 , because θ = 0

C) T = 0 , because θ =180°

D) T = μ × B

The direction of μ = -k , because the fingers points to the direction of current and the thump points to the direction of T.

T = (-k) × (-k)

=0

E) T = (k)×(k)

=0

So , the answer is 'A' .

Is it correct ?