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A point charge of 5 C is placed at point P as shown. A unit positive charge is taken from A to B along the circular path shown. Then the net work done by electostatic forces is (O is the centre of the circular path) (where k=9×10^9 N m^2 /C^2) Plzz explain +400k +4k -400k -4k

A point charge of 5 C is placed at point P as shown. A unit positive charge is taken from A to B along the circular path shown. Then the net work done by electostatic forces is (O is the centre of the circular path) (where k=9×10^9 N m^2 /C^2)
Plzz explain
  1. +400k
  2. +4k
  3. -400k
  4. -4k

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1 Answers

neo
18 Points
2 years ago
define potential at a as va = k(5)*100/5. the 5 in the denominator is via trigonometry if you dont understand plz refer to 
+1 ncert or pythagoras from class 8. next define potential at p as vb=k(5)*100/1. now va-vb. and voila the answer

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