Question

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Answer 1

Answer:

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Answer 2

Null point is a point where the electric field is 0.

Let the null point from 1μ charge be at xm, so null point from the other charge will be at (0.15 - x)m.

Electric field at null point due to charge 1μC = k x 10⁻⁶ /x²

Electric field at null point due to charge 4μC = 4k x 10⁻⁶ / (0.15-x)²

As electric field at null point is to be 0,

k x 10⁻⁶ /x² = 4k x 10⁻⁶ / (0.15-x)²

1/x² = 4/(0.15-x)²

or, 1/x = 2/(0.15 - x)

or, 2x = 0.15-x

or, 3x = 0.15

or, x = 0.05 m

So null point is at a distance 0.05 m from the 1μC charge and at a distance of 0.1 m from 4μC charge.