- #1

Shozaba

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## Homework Statement

A current 2A flows in a wire. Value of horizontal component of Earth magnetic field in the region is 2x10^-5T. Small compass placed 5cm due north of the wire. Calculate the angle through which the needle deflects due to the current flowing in the wire. Assume u0= 4pi x 10^-7 Hm^-1

## Homework Equations

B=uI/2piR

F=BILsinx

Pythagoras a2+b2=c2

## The Attempt at a Solution

Tried B=uI/2piR -> 2x10^-5=u2/2pi(0.05)

But that didn't make sense so I tried to solve for R instead and got R equal to 0.02 but didn't know what to do with R.

Then I tried using F=BILsinx and assumed sinx=90 assuming it was perpendicular but the question wants the angle through so I don't think F=BILsinx is relevant?

Please help thanks