Question

A test charge of +3 µC is at a point P where the electric field due to the other charges is directed to the right and has a magnitude of 4 106 N/C. If the test charge is replaced with a charge of -3 µC, what happens to the electric field at P?

Answer 1

Answer:

Electric field will remain same.

Explanation:

Given that

At initial condition ,charge q = +3μ C

Electric field E = 4106 N/c

As we know that

Electric field due to charge q

$E=\dfrac{kq}{r^2}$  

Now when charge is replaced by new charge q'= -3μ C

From the expression of electric field we can say that electric field will remain same from same quantity of electric charge.

So we can say that electric field will remain same.