Electrostatics Question 195

Question: Electric charges of 1μC,1μC and 2μC 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 [EAMCET (Engg.) 2000]

Options:

A) 0.9 N

B) 1.8 N

C) 2.7 N

D) 3.6 N

Show Answer

Answer:

Correct Answer: B

Solution:

FA = force on C due to charge placed at A

=9×109×106×2×106(10×102)2=1.8N

FB = force on C due to charge placed at B

=9×109×106×2×106(0.1)2=1.8N

Net force on C Fnet=(FA)2+(FB)2+2FAFBcos120o=1.8N



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