Explain with method pls..

See explanation below.

Explanation:

Given two blocks of masses M and m, And  a force F acting on the block of mass M pulling it outside.

The two masses system can be considered as a whole, With F  being the only external force acting on them.

Here the spring force has been ignored as while considering the two system as a whole, it will be accounted as an internal force for the system

Therefore, The acceleration of the system will be:

Now both the masses are moving with this same acceleration towards the direction of force .

Acceleration of mass m = a (as the system is moving as a whole)

Force on the mass m= mass times acceleration.

electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia