MCQ
With the decrease of current in the primary coil from $2\,amperes$ to zero value in $0.01\,s$ the $emf$ generated in the secondary coil is $1000\,volts$. The mutual inductance of the two coils is......$H$
- A$1.25$
- B$2.50$
- ✓$5$
- D$10$
✓
Answer
Correct option: C.
$5$
c
The emf induced in secondary is given by
The emf induced in secondary is given by
$\mathrm{e}=\frac{-\mathrm{MdI}}{\mathrm{dt}} \Rightarrow 1000=\mathrm{M}\left(\frac{2-0}{0.01}\right)$
(since current is reduced $dI$ $=-\text { ve }$)
$\Rightarrow \mathrm{M}=\frac{1000 \times 0.01}{2}=5.00 \mathrm{\,H}.$
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
To generate a power of $3.2\, mega\, watt$, the number of fissions of ${U^{235}}$ per minute is
→(Energy released per fission $= 200\,MeV, 1\,eV = 1.6 \times {10^{ - 19}}J)$
Consider two thermometers $T_1$ and $T_2$ of equal length, which can be used to measure temperature over the range $\theta_1$ to $\theta_2$. $T_1$ contains mercury as the thermometric liquid, while $T_2$ contains bromine. The volumes of the two liquids are the same at the temperature $\theta_1$. The volumetric coefficients of expansion of mercury and bromine are $18 \times 10^{-5} \,K ^{-1}$ and $108 \times 10^{-5} \,K ^{-1}$, respectively. The increase in length of each liquid is the same for the same increase in temperature. If the diameters of the capillary tubes of the two thermometers are $d_1$ and $d_2$, respectively. Then, the ratio of $d_1: d_2$ would be closest to
→The graph shows variation of $ v$ with change in $ u $ for a mirror. Points plotted above the point $P$ on the curve are for values of $v$
→The moment of inertia of semicircular ring about its centre is
Identify the wrong statement in the following. Coulomb's law correctly describes the electric force that
The variation of displacement with time of a particle executing free simple harmonic motion is shown in the figure. The potential energy ${U}({x})$ versus time $({t})$ plot of the particle is correctly shown in figure:
→A black body radiates $ 20\,W$ at temperature ${227^o}C$. If temperature of the black body is changed to ${727^o}C$ then its radiating power will be ..... $W$
→The tension of a stretched string is increased by $69\%$. In order to keep its frequency of vibration constant, its length must be increased by .... $\%$
→A plane wave is represented by $x = 1.2\sin (314\,t + 12.56y)$Where $x$ and $y$ are distances measured along in $x$ and $y$ direction in meters and $t$ is time in seconds. This wave has
→The total area of cross-section is $0.25\,m^2$. If the blood is flowing at the rate of $100\, cm^3/sec$, then the average velocity of flow of blood through the capillaries is ........ $mm/sec$
→