A 119 turn119 turn circular coil of radius 2.47 cm2.47 cm is immersed in a uniform magnetic field that is perpendicular to the plane of the coil. Over an interval of 0.167 s0.167 s , the magnetic field strength increases from 57.9 mT57.9 mT to 96.9 mT96.9 mT . Find the magnitude of the average emf avgEavg induced in the coil during this time interval, in millivolts.

Explanation:

Given that,

Number of turns is 119

N = 119

The radius of the coils is 2.47 cm

R = 2.47 cm = 0.0247m

Then, the area of the circular coil is given as

A = πr²

A = π × 0.0247²

A = 1.917 × 10^-3 m²

Time interval

t = 0.167s

The magnetic field strength increases from B1 = 57.9mT to B2 = 96.9 mT

Then,

∆B = B2 - B1 = 96.9 — 57.9 = 39 mT

∆B = 39 × 10^-3 T

We want find the average emf

EMF induced in a coil is given as

ε = -N dΦ / dt

Then, magnetic flux (Φ) is given as

Φ = BA

Then,

ε = -N dΦ / dt

ε = -N d(BA) / dt

Since the area is constant, so we have

ε = -N•A dB / dt

ε = -N •A • ∆B / ∆t

So, inserting the parameters above

ε = - 199 × 1.917 × 10^-3 × 39 × 10^-3 / 0.167

ε = 0.0891 V

To mV

ε = 89.1 × 10^-3 V

ε = -89.1 mV

Then, the magnitude of EMF induced in the coil is 89.1 mV

explanation:

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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