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Electric charge of 1 mu c, -1 mu C and ...

Electric charge of `1 mu c, -1 mu C and mu c` are placed in air at the corners A,B and C respectively of an equilateral triangle ABC having length of each side 10 cm .The resultant force on the charge at C is

A

`0.9 N`

B

`1.8 N`

C

`2.7 N`

D

`3.6 N`

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The correct Answer is:
B
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Electric charges of 1 mu C, 1 mu C and 2mu C are placed in air at the corners of A, B and C respectively of an equilateral triangle ABC having the length of the side 10 cm. The resultant force of C is (1/4 pi epsilon_(0) = 9 xx 10^(9) N-m^(2)/C^(2))

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