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\[ABC\] is a right angled triangle in which \[AB = 3\,cm\] and \[BC = 4\,cm\]. And $\angle ABC = \pi/2$. The three charges \[ + 15,\; + 12\] and \[ - 20\,e.s.u.\] are placed respectively on \[A\], \[B\] and \[C\]. The force acting on \[B\] is

Electrostatics

Question: \[ABC\] is a right angled triangle in which \[AB = 3\,cm\] and \[BC = 4\,cm\]. And $\angle ABC = \pi/2$. The three charges \[ + 15,\; + 12\] and \[ - 20\,e.s.u.\] are placed respectively on \[A\], \[B\] and \[C\]. The force acting on \[B\] is


1) \[125\;dynes\]
2) \[35\;dynes\]
3) \[25\;dynes\]
4) Zero
Solution: Explanation: 3e

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