Electromagnetic Theory MCQs Question and Answer in Engineering Physics

A. 120 μm

B. 60 μm

C. 30 μm

D. 15 μm

A. $$\frac{{{d^2}{\mu _x}}}{{d{t^2}}} + \gamma {B_0}{\mu _x} = 0$$

B. $$\frac{{{d^2}{\mu _x}}}{{d{t^2}}} + \gamma {B_0}\frac{{d{\mu _x}}}{{dt}} + {\mu _x} = 0$$

C. $$\frac{{{d^2}{\mu _x}}}{{d{t^2}}} + {\gamma ^2}B_0^2{\mu _x} = 0$$

D. $$\frac{{{d^2}{\mu _x}}}{{d{t^2}}} + 2\gamma {B_0}{\mu _x} = 0$$

A. repelled towards the lower field because it is diamagnetic

B. attracted towards the higher field because it is diamagnetic

C. repelled towards the lower field because it is paramagnetic

D. attracted towards the higher field because it is paramagnetic

A. $$ - \frac{{{q^2}}}{{4\pi {\varepsilon _0}\left( d \right)}}$$

B. $$ - \frac{{{q^2}}}{{4\pi {\varepsilon _0}\left( {2d} \right)}}$$

C. $$ - \frac{{{q^2}}}{{4\pi {\varepsilon _0}\left( {4d} \right)}}$$

D. $$ - \frac{{{q^2}}}{{4\pi {\varepsilon _0}\left( {6d} \right)}}$$

A. $$\overrightarrow {\bf{J}} {\text{ along }}{\bf{\hat r}};\overrightarrow {\bf{A}} {\text{ along }}{\bf{\hat z}};\left| {\overrightarrow {\bf{A}} } \right| \propto \frac{1}{d}$$

B. $$\overrightarrow {\bf{J}} {\text{ along }}\hat \phi ;\overrightarrow {\bf{A}} {\text{ along }}\hat \phi ;\left| {\overrightarrow {\bf{A}} } \right| \propto \frac{1}{{{d^2}}}$$

C. $$\overrightarrow {\bf{J}} {\text{ along }}{\bf{\hat r}};\overrightarrow {\bf{A}} {\text{ along }}{\bf{\hat z}};\left| {\overrightarrow {\bf{A}} } \right| \propto \frac{1}{{{d^2}}}$$

D. $$\overrightarrow {\bf{J}} {\text{ along }}\hat \phi ;\overrightarrow {\bf{A}} {\text{ along }}\hat \phi ;\left| {\overrightarrow {\bf{A}} } \right| \propto \frac{1}{d}$$

A.

B.

C.

D.

A. P-2, Q-4, R-3, S-1

B. P-4, Q-2, R-1, S-3

C. P-2, Q-4, R-1, S-3

D. P-4, Q-2, R-3, S-1

A. 7.4 × 10^-4 m/s

B. 74 × 10^-4 m/s

C. 74 × 10^-3 m/s

D. 7.4 × 10^-5 m/s

A. the point charge is highly accelerated

B. the electric and magnetic fields are not perpendicular

C. the point charge is moving with velocity close to that of light

D. the calculation is done for the radiation zone i.e., far away from the charge

A. monopole moment

B. dipole moment

C. quadrupole moment

D. octopole moment