$ABC$ is a right angled triangle in which $AB = 3cm$ and $BC = 4cm.$ 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 acing on $B$ is

Question

Dr. Abubacker · Accepted Answer

(c) Net force on $B\ F_{net} = \sqrt{F_{A}^{2} + F_{C}^{2}}$
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$F_{A} = \frac{15\  	imes \ 12}{(3)^{2}} = 20\ dyne,\ F_{C} = \frac{12\  	imes \ 20\ }{(4)^{2}} = 15dyne$
$\Rightarrow F_{net} = \sqrt{F_{A}^{2} + F_{C}^{2}} = \sqrt{(20)^{2} 	imes (15)^{2}} = 25dyne$

Q. $ABC$ is a right angled triangle in which $AB = 3cm$ and $BC = 4cm.$ 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 acing on $B$ is

Explanation

Reviewed by Dr. Abubacker

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