Two particles A and B having mass m each and charge q1 and -q2 respectively, are connected at the ends of a non conducting flexible and inextensible string of the length I. The particle A is fixed and B is whirled along a vertical circle with centre at A. If a vertically upward electric field of strength E exists in the space, then for minimum velocity of particle B :
(a) the tension force in string at lowest point is zero
(b) the tension force at the lowest point is non-zero
(c) the tension force at the highest point is zero
(d) the work done by interaction force between particles A and B is non-zero
1
Expert's answer
2017-03-13T13:59:06-0400
The answer is (b) because with zero tension at the lowest point rotating is impossible.
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