In series LCR circuit, the phase difference between applied voltage and current is

• Positive when X_L > X_C

• positive when X_C > X_L

• 90^o

• 0^o

What is the dimensions of a magnetic field B in terms of C ( = coulomb ), M, L, T?

• [ M¹ L^-1 T^-2 C ]

• [ M¹ L⁰ T^-1 C^-1 ]

• [ M¹ L⁰ T^-2 C ]

• [ M¹ L⁰ T^-1 C ]

What is the mechanical equivalent of spring constant kin LC oscillating circuit?

• $\frac{1}{\mathrm{L}}$

• $\frac{1}{\mathrm{C}}$

• $\frac{\mathrm{L}}{\mathrm{C}}$

• $\frac{1}{\mathrm{L} \mathrm{C}}$

Energy stored in between the plates of parallel plate capacitor of area A, separated by distance d is

• $\frac{1}{2}$ε₀ E² Ad 

• $\frac{1}{2}$ε₀ E² $\frac{\mathrm{A}}{\mathrm{d}}$

• $\frac{1}{2}$ε₀$\frac{\mathrm{d}}{{\mathrm{E}}^2 \mathrm{A}}$

• $\frac{1}{2} \frac{\mathrm{A} \mathrm{d}}{{\mathrm{\epsilon }}_0 {\mathrm{E}}^2}$

Magnetic energy per unit volume is represented by

• $\frac{{\mathrm{B}}^2}{2 {\mathrm{\mu }}_0}$

• $\frac{{\mathrm{B}}^2}{2 {\mathrm{\mu }}_0^{ 2}}$

• $\frac{2 {\mathrm{B}}^2}{{\mathrm{\mu }}_0}$

• $\frac{{\mathrm{B}}^2}{{\mathrm{\mu }}_0}$

Mutual inductance M between two concentric coils of radii 1 m and 2 m is

• $\frac{{\mathrm{\mu }}_0 \mathrm{\pi }}{2}$

• $\frac{{\mathrm{\mu }}_0 \mathrm{\pi }}{4}$

• $\frac{{\mathrm{\mu }}_{0 }\mathrm{\pi }}{8}$

• $\frac{{\mathrm{\mu }}_0 \mathrm{\pi }}{10}$

Which of the following subsances magnetic susceptibility χ_m is negative?

• Diamagnetic

• Paramagnetic

• Ferromagnetic

• antiferromagnetic

When orientation. of dipoles parallel and antiparallel to magnetic field is distributed unequally, then the material is

• paramagnetic

• ferromagnetic

• ferrimagnetic

• antiferromagnetic

Lenz law is consistent with conservation of

• Energy

• Mass

• Charge

• Momentum

30.

Magnetic field at ' $𝑎$' distance a from long currying current wire is proportional to

• $\frac{1}{𝑎}$

• $\frac{1}{{𝑎}^2}$

• $\frac{1}{\sqrt{𝑎}}$

• $\frac{1}{{𝑎}^{{\displaystyle \raisebox{1ex}{$3$}\!\left/ \!\raisebox{-1ex}{$2$}\right.}}}$