ElectrostaticsHard

Question

The magnitude of electric force on 2 μ c charge placed at the centre O of two equilateral triangles each of side 10 cm, as shown in figure is P. If charge A, B, C, D, E & F are 2 μ c, 2 μ c, 2 μ c, -2 μc, - 2 μ c, - 2 μ c respectively, then P is:

Options

A.21.6 N
B.64.8 N
C.0
D.43.2 N

Solution


The given figure shows force diagram for charge at O due to all other charges with r = cm
∴     Fnet = 2F + 4F cos 60o = 4F
= = 36 × 4 × 300 × 10-3 N = 43.2 N. (Towards E)

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