The main source of information is the National Electric Code or the NEC. However, always track changes and amendments to the national electric code as this is the same as any law or regulation. This is universal, however, some states or cities may have their own subset of regulations about the electric code for their residents.
AC can be produced using a device called an alternator. This device is a special type of electrical generator designed to produce alternating current. A loop of wire is spun inside of a magnetic field, which induces a current along the wire.
B. Strong nuclear
Because the strong nuclear force is the strongest at short distances, it dominates over the other forces and the two protons become bound, forming a helium nucleus (typically a neutron is also needed to keep the helium nucleus stable).
The correct answer is x-rays
D , a , c , d , d , c , d