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A charge +Q is fixed. Another charge +2q and mass M is projected from a distance R from the fixed charge at and angle 30 with the horizontal towards the fixed charge (like a projectile) at a speed of vFind the minimum separation between the two charges if the velocity becomes 1/√3 times of the projected velocity at this moment (assume gravity to be absent)ANSWER : sqrt(3) R/2, i have been trying energy conservation but unable to get this answer plz.. help ..thnx in advance
You must try Conservation of angular momentum
distance will be minimum when there will be no component ofthe velcty of the movable particle towards the centre (i.e the fxed particle)
in this case you get a right andled triangle and the asnwer comes root 3 R/2
no need to conserver energy,
use basic concepts!!!
Ya,that''s fine but why should we conserve angular momentum ,because net torque acting on the charge 2q is not zero(due to force exerted at an angle by charge Q),so angular momentum should not remain conserve,plz correct me if iam wrong..
thnx for the reply,but i did not get you...how will it it be a right angled triangle???????
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