Like charges ____________ each other and unlike charges ____________ each other :
Two like magnetic poles :
(a) repel each other
(b) attract each other
(c) first attract each other, then repel
(d) neither attract nor repel.
Two unlike charges separated by a distance of 1m attract each other with a force of 0.108N. If the charges are in the ratio 1:3, the weak charge is :