Question

1. Question

One of the four fundamental interactions in nature is?

A. Electromagnetism
 
B. Gravity 

C. Strong interaction 

D. All of the above

2. Question

Electromagnetic force is sometimes called?

A. Einstein force

B. Lorentz force

C. Newton force

Answer 1

All of the forces listed are correct. There are 4 presently known forces.
Second question os B. the Lorentz force. It's given by
F=q(E+VxB) where q is the electric charge, E is the electric field, V is the particle's velocity vector, B is the magnetic flux density, and "x" represents the vector cross product.