# Homework Help: Struggling with point charges

1. Apr 15, 2015

### jn.4846

Hey guys, new to this forum. Currently studying a mechanical engineering degree (first year), but I'm having real problems with some of the electrical side of it, mainly electric fields.

Any tips or help on how to answer these two questions:

1. Two point charges of +3.1 muC are seperated by a distance of 2.4cm. What would be the total force on a +0.25 uC point charge placed between them, 1cm away from one of them? (answer given 34.2 N away from nearest charge)

2.Two point charges of +3.1 muC are seperated by a distance of 2.4cm. What would be the electric field strength between them, 1cm away from one of them? (answer given 137 N/C)

I realise that the muC seems a little strange, I have taken this to mean (*10-6), but I wrote it as muC as this is how it is written in my textbook.

Thanks for any help given!

2. Apr 15, 2015

### Orodruin

Staff Emeritus
Hi jn, welcome to PF

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