What is the name given to wires attached to LED ? How are these wires connected to a battery ?

A wire of length 10 meter is connected between the terminals of a battery of e.m.f. 8 volts. Later that wire is cut into 5 equal parts. These are connected parallel and the end terminals are connected to battery. In the second case battery give more electric power which is the incorrect option of the following ?

A potentiometer wire of length L and a resistance r are connected in series with a battery of e.m.f. E and a resistance r_(1) . An unknown e.m.f. E_(o) is balanced at a length l of the potentiometer wire. The e.m.f. E will be given by

A parallel plate capacitor has a capacity 80 xx 10^(-6) F, when airs present between the plates. The volume between the plates is then completely filled with a dielectric slab of dielectric constant 20. The capacitor is now connected to a battery of 30 V by wires. The dielectric slab is then removed. Then, the charge that passes now through the wire is

A parallel plate capacitor has a capacity 80xx10^(-6)F , when air is present between its plates. The space between the plates is filled with a dielectric slab of dielectric constant 20. The capacitor is now connected to a battery of 30V by wires. The dielectric slab is then removed. Then, the charge passing through the wire is