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## Homework Statement

There are two infinitely long wires A and B, each carries a current of 1 Amp in the same direction. The two wires are 4m apart.

a) Calculate the magnetic field created by the currents in the two wires at points C and D. Point D is 1m away from wire A and point C is 2m away from A.

b) Calculate the work required to move a point charge of +1x10-6 C from point C to point D along the shortest path.

## Homework Equations

B = µ0I / 2πr

F = qvB

W = qEd

E = F/q

## The Attempt at a Solution

I was able to work out part a) no problem and found the magnetic field at point D is 6.6*10^-8 T and at point C its 2*10^-7 T. My problem is wit part b) :/ How do I find the work done moving a charge from one magnetic field to another? I played around with the formulas a bit and got W = qvBd, but my problem is what do I use for B? Would I be correct in saying that B is the sum of the two magnetic fields? I'm also not given a value for the velocity v so am I going about this the wrong way?

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