Question

Two identical tiny spheres have the same electric charge. If the electric charge on
each of them is doubled, and their separation is also doubled, the force each exerts
on the other will be
(a) half.
(b) double.
(c) four times larger.
(d) one-quarter as large.
(e) unchanged.

I didn't understand the meaning of "separation is doubled"​

Answer 1

Lectures 1 2 and 3 Average Speed & Average Velocity vavgdistancetime=dt *speed is a scalar (magnitude with no direction vavgdisplacementtime= rt * velocity is a vector (has direction) → UNITS: ms vavg and r point in direction of motion vx= xf-x0t → xf=x0+t(vx) *with constant velocity  Negative slope = negative velocity  Steeper slope = faster speed Acceleration aavgvt *rate of change of velocity (slowing, speeding, changing direction) aavgv - n+1 n → UNITS: ms 2 → If v and a are point in the same direction, the object is speeding up afree fall0 ms2 → 1 dimensional acceleration down a slope: as= g(sin) Ki