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Physics electric potential question

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1. http://filestore.aqa.org.uk/subjects...W-QP-JUN10.PDF

For question 13 the answer is 24 mm

But I get this working out , can some explain what in doing wrong ?
2. I've moved this to the physics study help forum where hopefully you'll get more responses
3. The LHS of your first line, the 16x10^-6 shouldn't be negative. The electric potential doesn't depend on the +/- of the charge, just its magnitude.
4. (Original post by YB7WZ11)
The LHS of your first line, the 16x10^-6 shouldn't be negative. The electric potential doesn't depend on the +/- of the charge, just its magnitude.
Thanks mate ! Stupid mistake lol
5. (Original post by YB7WZ11)
The LHS of your first line, the 16x10^-6 shouldn't be negative. The electric potential doesn't depend on the +/- of the charge, just its magnitude.
This is not true, although it does correct the mistake he has made. Electric potential does depend on the sign of the charge, however, the user in question wrote out:

When the correct first line should have been:

This has the effect of flipping a sign by mistake, which you correctly spot. However, it is not because the electric potential doesn't depend on the sign of the charge.
6. (Original post by YB7WZ11)
The LHS of your first line, the 16x10^-6 shouldn't be negative. The electric potential doesn't depend on the +/- of the charge, just its magnitude.
This is very bad physics

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