Three point charges + q each are fixed at A(L/2,L/2,0),B(−L/2,L/2,0),C(0,−L,0). A fourth point charge – q and mass ‘m’ is kept on z-axes at D (0,0,Z) with Z<

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2π3∈0mL33qm2m

π3∈0mL3q2m

2π3∈0mL33q2

π3∈0mL33q2

answer is D.

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Detailed Solution

Fnet=3Fcos⁡θ=−314πϵ0q2r2zr=−3q2z4π∈0r3≈−3q2z4π∈0L3 ∵r=L2+z2r≈L for z <

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