Answer:
Zero according to ohm's law R= V / i
The circumference of a circle is (pi) x (diameter)
The circumference of the cupcake is (pi) x (5 cm)
Halfway around is (1/2) x (pi) x (5 cm) = (2.5 pi cm) = <em>about 7.85 cm</em>
The 'why' appears up above, in the first 2 lines of this solution.
Force between two charges is given by



Now in order to find the acceleration of each mass
we can use
F = ma
