Answer:
The answer to the given points can be defined as follows:
Explanation:
In point 1:
put the value in the above formula:


for point 2:
for point 3:


Answer:
A) do a greater amount of work than the amount of work done on the machine
Explanation:
By the principle of conservation of energy, energy can never be created or destroyed.
To do more work by a machine than the amount of work done on the machine is impossible because to do so machine will have to create energy within itself which violates the principle of conservation of energy.
Extra bit,
These kind of machine are defined as perpetual-motion machines and there are many attempts in history to create one such device but all were failed.
Answer:

Explanation:
B at point 7.0 cm radially outward is to find out?
Now for field strength in case of parallel plates in given as



For the second part as Capacitor is fully charged no more flow of current could take place hence
I= Current =o
so B = 0
Most objects move at a constant speed because of friction and acceleration. The constant speed keeps them in place, and keeps a balance.