UP Board Class 12 Magnetism & EMI — practice questions
12 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice UP Board Class 12 Magnetism & EMI in the app →A circular loop of area $0.02\,\text{m}^2$ is placed with its plane making an angle of $60^\circ$ with a unifoA $50$-turn coil has a magnetic flux changing through it at a uniform rate of $4 \times 10^{-3}\,\text{Wb/s}$.Lenz's law is a direct consequence of:A straight rod of length $0.5\,\text{m}$ moves with a velocity of $4\,\text{m/s}$ perpendicular to a uniform mThe SI unit Henry (H) is equivalent to:The self-inductance of a long air-cored solenoid of length $\ell$, cross-sectional area $A$ and total number oTwo coils of self-inductances $L_1$ and $L_2$ are coupled with mutual inductance $M$ and coupling coefficient The energy stored in an inductor of inductance $L$ carrying a steady current $I$ is:A coil of $N$ turns and area $A$ rotates with angular velocity $\omega$ about an axis perpendicular to a unifoEddy currents in the metallic rails ahead of a moving train can be used for magnetic braking because:An ideal inductor $L$ and resistor $R$ are connected in series across a DC source of EMF $\varepsilon$. The tiAn ideal LC circuit oscillates freely. If $L = 4\,\text{mH}$ and $C = 25\,\mu\text{F}$, the angular frequency