The relation between the angle of incidence and the angle of refraction is known as Snell's Law. Since the light travels with different speed in different media, the direction of the ray of light will change when it crosses the boundary between the two media
If the forces are equal, at a distance equidistant it is not possible to act a pair on the body since both torques cancel each other. Being of the same magnitude and in the opposite direction, the sum of the torques will be zero.
Answer:

Explanation:
From the question we are told that:
Angular speed 
Radius 
No. Turns 
Area 
Magnetic field. 
Acceleration 
Time 
Generally the equation for momentum is mathematically given by



Therefore



Generally the equation for Peak emf is mathematically given by



A medium is a substance or material that carries the wave. Sounds waves need a medium in order to travel through a wave to help it travel as it cannot travel through a vacuum. Mechanical waves need a medium to transport energy.