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Electric charge of 1 muC, -1 muC and 2 m...

Electric charge of `1 muC, -1 muC` and `2 muC` 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

Text Solution

Verified by Experts

The correct Answer is:
B
r = 0.1m
`F_("net")=sqrt(F_(CA)^2 +F_(CB)^2+2F_(CA) .F_(CB)cos120)`
`=sqrt(F^2+F^2+2F^2(-1//2))=F`

`:. F=(Kq_Aq_c)/(r^2)=(9xx10^9xx1xx2xx10^(-12))/((0.1)^2)=1.8 N`
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