According to Ohm’s law, which combination of units is the same as the unit for voltage? ohm ÷ ampere
ampere × ohm
ohm + ampere
ampere ÷ ohm

According to Ohm's law :

Where,

V is the potential difference or voltage.

I is the current flowing in a circuit.

R is the resistance.

The SI unit of potential difference is Volt. It is denoted as V.

The SI unit of current is Ampere. It is denoted as A.

The unit for resistance is :

It is equivalent to Ohm or .

Hence, the correct option is (a) " volt ÷ ampere ".

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