Question: Q. 1. Five charges, q each are placed at the corners of a regular pentagon of side a.

(i) What will be the electric field at O if the charge from one of the corners (say A ) is removed ?

(ii) What will be the electric field at O if the charge q at A is replaced by q ?

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Solution:

Ans. (i) 14πε0qr2 along OA

(ii) 14πε02qr2 along OA

[CBSE Marking Scheme, 2017]

Commonly Made Error

  • Some candidates find resultant force F as a scalar sum of all forces, but resultant force is equal/to vector sum of all forces.

Detailed Answer :

(i) If a charge q is removed frompoint A, a negative charge is developed at A where electric field will be E=14πε0qr2 which is along OA.

(ii) If a charge q is replaced by charge q at point A, there generates a net electric field at point O as a result of 2q charge, so

E=14πε02qr2 E=14πε02qr2 along OA



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