What Is the New Electric Field When Charge and Distance Are Changed?

[kirby2]

An electric field of magnitude E is measured at a distance R from a point charge Q. If the charge is doubled to 2Q and the electric field is now measured at a distance of 2R from the charge, the new measured value of the field will be?

ATTEMPT: using the formula E=(k)(q/r^2) i think the answer is E/2. is this right?

 

[gneill]

An electric field of magnitude E is measured at a distance R from a point charge Q. If the charge is doubled to 2Q and the electric field is now measured at a distance of 2R from the charge, the new measured value of the field will be?

ATTEMPT: using the formula E=(k)(q/r^2) i think the answer is E/2. is this right?

Looks good.