Physics
Electromagnetism
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#17 The cyclotron frequency is given by
A) $f=\frac{qB}{2\pi m}$
B) $f=\\frac{2\pi m}{qB}$
C) $f=\frac{qB}{m}$
D) $f=\frac{m}{qB}$
#18 The radius of the path of a charged particle in a magnetic field is given by
A) $r=\frac{mv}{qB}$
B) $r=\frac{qB}{mv}$
C) $r=\frac{mv^2}{qB}$
D) $r=\frac{qB}{mv^2}$
#19 The magnetic moment of a current loop is given by
A) $\mu=NIA$
B) $\mu=\\frac{NI}{A}$
C) $\mu=\\frac{NA}{I}$
D) $\mu=NIA^2$
#20 The SI unit of magnetic moment is
A) A m$^{2}$
B) A/m$^{2}$
C) A$^{2}$ m$^{2}$
D) A/m
#21 The permeability of free space $\mu_0$ is
A) $4\pi \times 10^{-7}$ T·m/A
B) $4\pi \times 10^{-7}$ A/T·m
C) $4\pi \times 10^{-7}$ T/A·m
D) $4\pi \times 10^{-7}$ A·m/T
#22 The magnetic susceptibility $\chi_m$ is defined as
A) $\chi_m = \frac{M}{H}$
B) $\chi_m = \frac{H}{M}$
C) $\chi_m = \frac{B}{H}$
D) $\chi_m = \frac{H}{B}$
#23 The relative permeability $\mu_r$ is defined as
A) $\mu_r= \frac{\mu}{\mu_0}$
B) $\mu_r= \frac{\mu_0}{\mu}$
C) $\mu_r= \frac{B}{H}$
D) $\mu_r= \frac{H}{B}$
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