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## Homework Statement

A small current loop of area A = 1.5cm^2 carries current I = 3.6mA. What torque acts on it in a lab where its magnetic moment is perpendicualr to the earth's magnetic field of

4.2 x 10^-5

(b) Find its angular acceleration if its rotational inertia about a diameter is 6.2gcm^2

## Homework Equations

T = m x B

m = IA

## The Attempt at a Solution

I know that m = (.015)(.0036) = 5.4 * 10^-5.

T = abs(5.4 * 10^-5) * abs(B) * Sin(PI/2)

I'm a bit confused about what B is, should I use the B for Earth's magnetic field???