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Charges q and -Q lie on the x axis at x = 0 and x =...

Charges q and -Q lie on the x axis at x = 0 and x = d respectively. Charge -Q has a greater magnitude than q. In which region or regions on the x axis is there a position where the electric field is zero?

a.) x > d

b.) x < 0 and x > d

c.) x < 0

d.) 0 < x < d and x > d

e.) 0 < x < d

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Answer #1

Charge 'q' is at origin and charge '-Q' is at a distance 'd' from origin on positive x-axis.

When a unit +ve charge is placed at a point on the -ve x-axis , the electric force on this charge due to ' q ' is towards left ( like charges repel ) with lesser magnitude , and electric force on this charge due to ' -Q ' is towards right ( unlike charges attract ) with greater magnitude as -Q > q.

Then the net electric field due to the two charges will be zero.

Answer is .

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