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In question number 45, what will be the ...

In question number 45, what will be the electric field at O if the charge q at A is replaced by -q?

A

`(q)/(4piepsilon_(0)r^(2))` along OB

B

`(2q)/(4piepsilon_(0)r^(2))` along OA

C

`(4q)/(4piepsilon_(0)r^(2))` along OC

D

zero

Text Solution

Verified by Experts

The correct Answer is:
B
If the charge q at A is replaced by -q, it is equivalent to adding charge -2q at A. Therefore, electric field at O, `E_(2)=(2q)/(4piepsilon_(0)r^(2)` along OA.
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