An electroscope has a charge of −2.0 µc while your finger has a charge of 2.7 µc. you touch the electroscope with your finger and discover that the charges of your finger and the electroscope are now the same. in this process, electrons were transferred from the electroscope to your finger. how many electrons were transferred in order for your finger and the electroscope to have the same charge?

1.39 × 10⁻¹³ electrons were transferred

Explanation:

Given:

Charge on electroscope = - 2.0 μC

charge on finger = 2.7 μC

Now,

The net charge when in contact

= Charge on electroscope + charge on finger

or

The net charge when in contact = - 2.0 μC + 2.7 μC = 0.7 μC

Also,

Charge on the electroscope and the finger is same

thus,

The charge on the electroscope =

or

The charge on the electroscope =

or

The charge on the electroscope = 0.35 μC

Now,

The change in charge on the electroscope

= Final charge - Initial charge on the electroscope

= 0.35 μC - (- 2.0 μC)

or

The change in charge on the electroscope = 2.35 μC

also,

Charge = Number of electrons × Charge on an electron

or

2.35 μC = Number of electron  × 1.69 × 10⁻¹⁹ C

or

2.35 × 10⁻⁶ C = Number of electron  × 1.69 × 10⁻¹⁹ C

or

Number of electron =

or

Number of electron = 1.39 × 10⁻¹³ electrons were transferred.

what are the statements? x

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