Thu June 21, 2012 By: Arvindh Jambunathan

Q Two point charges are located 20 cm apart in vacuum, (i) Find the electric field at the mid point of the line AB joining the two charges, (ii) If a negative test charge of magnitude is placed at the centre, find the force experienced by the test charge. 2

Expert Reply
Thu June 21, 2012
Electric field due a positive test charge is pointed in the outwards direction
thus in both cases the electic field's magnitude at the centre will be equal  but will be directed opposite to each other thus electric field at the centre will be 0
since there is no electric field and force = charge  x electric field
thus there will be no force on the test charge
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