Force on 20cm wire carrying 10A at 40° to 0.3T field

[uzair_ha91]

Homework Statement

A 20cm wire carrying a current of 10A is placed in a uniform
magnetic field of 0.3T. If the wire makes an angle of 40 degrees with
the direction of magnetic field, find the force acting on the wire.

Homework Equations

F=LIB sin<theta>

The Attempt at a Solution

I got the answer:: 0.35, but in the textbook, the answer written at the back is 0.39...which one's correct??

 

[Dadface]

Homework Statement

A 20cm wire carrying a current of 10A is placed in a uniform
magnetic field of 0.3T. If the wire makes an angle of 40 degrees with
the direction of magnetic field, find the force acting on the wire.

Homework Equations

F=LIB sin<theta>

The Attempt at a Solution

I got the answer:: 0.35, but in the textbook, the answer written at the back is 0.39...which one's correct??

Rounding my answer down I agree with the book.I bet you punched the wrong calculator button when you was working out the sin.Sin40=0.643