Magnetic Effects of Current and Magnetism Test

Result

Magnetic Effects of Current and Magnetism Test - 3

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following has the highest magnetic permeability?

A
Paramagnetic substance

B
Diamagnetic substance

C
Ferromagnetic substance

D
Vacuum

Solution

Ferromagnetic substances have a very high (of the order 1000 or more) and positive susceptibility (x). Now, μ_r= 1 + x.
Question 2
1 / -0

For a paramagnetic material, the dependence of magnetic susceptibility X on absolute temperature T is given by (C is a constant)

A
X = CT

B
X = C/T

C
X = CT²

D
X = C/T²

Solution

According to Curie's law, susceptibility is related to temperature T as
x = C/T
Where, C is Curie's constant.
Question 3
1 / -0

The effective length of a magnet is 31.4 cm and its pole strength is 0.5 A-m. What will be the magnetic moment if it is bent in the form of a semicircle?

A
0.1 A-m²

B
0.01 A-m²

C
0.2 A-m²

D
1.2 A-m²

Solution

If L is length of the magnet, then magnetic moment, M = mL (where m is the pole strength).
When same magnet is bent into a semicircle of radius r, then L = πr
Separation between the poles = 2r
New magnetic moment of the bar magnet is: