MCQs of Magnetism and Matter

Magnetism and Matter MCQs

MCQs of Magnetism and Matter

Showing 141 to 145 out of 145 Questions

141.

The length of a magnet is large compared to its width and breath. Its periodic time of oscillation is 2 second. It is cut perpendicular to its length into three equal parts. These three parts are placed on each other with their like poles together. Calculate the new periodic time.

(a)	2 s
(b)	$\frac{2}{3} s$
(c)	$2 \sqrt{3} s$
(d)	$\frac{2}{\sqrt{3}} s$

142.

Calculate the work done in rotating the magnetic dipole from angle θ₁ to θ₂ in uniform magnetic field

\vec{B}

. θ is the angle between

\vec{m}

and

\vec{B}

(a)	$ω = m B (\cos θ_{1} + \cos θ_{2})$
(b)	$ω = m B (\cos θ_{2} - \cos θ_{1})$
(c)	$ω = m B (\cos θ_{1} - \cos θ_{2})$
(d)	$ω = m B (1 - \frac{\cos θ_{2}}{\cos θ_{1}})$

143.

Which of the following statement is true ?

(a)	Unit of magnetic field is $\frac{N}{A m^{2}}$
(b)	Unit of permeability is $\frac{N}{A^{2}}$
(c)	Unit of magnetic flux is T m
(d)	Unit of magnetic susceptibility is $\frac{N}{m}$

144.

Give the unit of magnetic induction (B).

(a) $Wb m^{2}$

(b) $\frac{Wb}{m^{2}}$

(c) $\frac{Wb}{m}$

(d) $\frac{Wb}{m^{3}}$

145.

Give the formula of Curie's law for paramagnetic substance.

(a)	$x_{m} \propto \frac{μ_{0}}{T}$
(b)	$x_{m} \propto \frac{C μ_{0}}{T}$
(c)	$x_{m} \propto \frac{T μ_{0}}{C}$
(d)	$x_{m} \propto \frac{C T}{μ_{0}}$

Showing 141 to 145 out of 145 Questions