Small identical balls with equal charge are fixed at the vertices of a reggular hexagon after of N sides ,each of length a At a certain instant one of the ball is releases and after a sufficiently long time the adjacent ball is released .The kinetic energies of the two releases balls differ by k at a sufficenlty long distance from the polygon . Determine the charge on each ball.
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A bag contains b blue balls and r red balls. If two balls are drawn at random, the probability drawing two red balls is five times the probability of
Correct Answer - A::B Let the number of red and blue balls be r and b, respectively. Then, the probability of drawing two red balls is `p_(1) = (.^(r )C_(2))/(.^(r+b)C_(2)) =...
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A bag contains `W` white and 3 black balls. Balls are drawn one by one without replacement till all the black balls are drawn. Then find the probabili
Procedure of drawing th balls has to end at the rth draw. So, exactly two black balls are drawn in first (r-1) draws and third black ball is drawn in...
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A box contains 24 identical balls of which 12 are white and 12 are black. The balls are drawn at random from the box one at a time with replacement. T
Correct Answer - C In any trial P (getting white ball) = P (W) =1/2 P(getting black ball)`=P(B)=1//2` Required event will occur if in the first six trial, 3 white balls...
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A box `B_(1)` contains 1 white ball, 3 red balls, and 2 black balls. An- other box `B_(2)` contains 2 white balls, 3 red balls. A third box `B_(3)` co
Correct Answer - A P (required) = P (all are white) + P (all are red) + P (all are black) `=1/6xx2/9xx3/12+3/6xx3/9xx4/12+2/6xx4/9xx2/12=6/648+36/648+40/648=82/648`
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Four identical charges, Q each, are fixed at the vertices of a square. A free charge q is placed at the centre of the square. Investigate the nature o
Correct Answer - stable equilibrium
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Three small equally charged identical conducting balls are suspended from identical insulating threads secured at one point. Length (L) of the threads
Correct Answer - (a). `((2)/(3))^((1)/(3))a` (b). `((1)/(9))^((1)/(3))a`
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A cylindrical tube has a length of 60 cm. Three identical convex lenses, each of focal length `f = 10` cm are fixed inside the tube, one at each of th
Correct Answer - The image does not move
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Three small identical netural balls are the verstices of an equilateral triangle . The balls are connected to a large charged sphere held above the pl
Correct Answer - `q_(3)=(q_(2)^(2))/(q_(1))`
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Small identical balls with equal charges are fixed at vertices of regular 2009 -gon with side a. At a certain instant, one of the balls is released &
Correct Answer - `[sqrt(4piin_(0)Ka)]`
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Two identical balls of charge `q_(1)` & `q_(2)` initially have equal of the same magnitude and direction. After a ubiform electric field is applied fo
Correct Answer - `(v)/(sqrt(3))`
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