A battery establishes a voltageV on a parallel-plate capacitor. After the battery is disconnected, the capacitor doesn't loss charge however the distance between the plates is doubled and the area of the and the voltage between the plates plates is quadrupled. Accordingly, the capacitance A. increases; decreases.
B. decreases; increases.
C. increases; increases.
D. decreases; decreases
E. stays the same; stays the same.

E

Explanation:

I me and my friends did a project on this

there are no contact forces mentioned on the list of choices that you've provided.

the answer is the first electromagnet (a). this is because it has more coils around the ferromagnetic material. increasing the number of coils increases the surface area in which the metal interacts with the current in the coil. this enables more atoms in the metal to become aligned hence becoming more magnetized.