A force exists between two point charges in air. If the charges are moved to a medium having εr = 5 without altering the distance between them, the new force between them will?
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Answer:
Er = 5
Er =F(air)÷F(medium)
5 = Fa÷Fm
Fm = Fa÷5
Fm = 0.2× Fa
new force will be 0.2 times of previous force.
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