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Most Important Selected Qs for JEE AdvancedPhysicsElectrostatics

Two fixed charges -2 Q and Q are located at the point of co-ordinates (-3 a, 0) and (3 a, 0) respectively in (x-y) plane. Then all the points in x-y plane where potential is zero lies on a

Options

  1. Astraight line parallel to x -axis
  2. Bstraight line parallel to y - axis
  3. Ca circle of radius 4 a
  4. Dcircle of radius 2 a

Correct answer

C. a circle of radius 4 a

Step-by-step solution

aligned & P ( x , y ), A (-3 a , 0), B =(3 a , 0) & V _ PA = 1 4 ₀ -2 Q PA , V _ PB = 1 4 ₀ Q PB aligned According to equation aligned & 1 4 ₀ ( -2 Q PA )+ 1 4 ₀ Q PB =0 & 2 PA = 1 ~PB 4 ~PB ^2= PA ^2 & ( x -5 a )^2+ y ^2=(4 a )^2 aligned

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