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    Four charges of +5.0 nC, +8.0 nC, -2.0nC and -4.0nC are positioned in air at the corners ABCD of a square of side 10cm. Calculate (a) the electric field strength and b) the potential at the centre of the square.

    For a) can I just sum the field strengths directing toward the centre? and then use use E = kq. As for b, I'm not sure how to calculate the potential at the centre
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    b) is easier. Potential is a scalar. Just add the individual potentials (V = q/4pieor)

    In a ) E is a vector. You needto add the individuals Es vectorially takinginto account directions.
 
 
 
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