MCQ
Inside a parallel plate capacitor the electric field $E$ varies with time as $t^2$. The variation of induced magnetic field with time is given by
- ANo variation
- B$t^3$
- ✓$t$
- D$t^2$
✓
Answer
Correct option: C.
$t$
c
$E \propto t^{2}$
$E \propto t^{2}$
$B=\frac{d E}{d t} \quad B=\frac{d}{d t}\left(t^{2}\right), B=2 t$
$B \propto t$
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
Two capacitors $C_1 = 4\ \mu F$ and $C_2 = 2\ \mu F$ are charged to same potential $ V = 500\ Volt$, but with opposite polarity as shown in the figure. The switches $S_1$ and $S_2$ are closed.
→Assertion : Fragments produced in the fission of $\mathrm{U}^{235}$ are radioactive.
Reason : The fragments have abnormally high proton to neutron ratio.
→Reason : The fragments have abnormally high proton to neutron ratio.
The net resistance of a voltmeter should be large to ensure that
In a double slit experiment, at a certain point on the screen the path difference between the two interfering waves is $\frac{1}{8} ^{th}$ of a wavelength. The ratio of the intensity of light at that point to that at the centre of a bright fringe is
→Which among the following is true
A plano convex lens is made of glass of refractive index $1.5$. The radius of curvature of its convex surface is $R$. Its focal length is
→Dynamo is a device for converting
Two capacitors of $10\,\mu \,F$ and $20\,\mu \,F$ are connected in series with a $30\,V$ battery. The charge on the capacitors will be, respectively
→Surface of certain metal is first illuminated with light of wavelength ${\lambda _1} = 350\,nm$ and then, the light of wavelength ${\lambda _2} = 540\,nm$. It is found that the maximum speed of the photo electrons in the two cases differ by a factor of $2$. The work function of the metal (in $eV$) is close to: (Energy of photon $ = \frac{{1240}}{{\lambda {\rm{(in\, nm)}}}}\,eV$)
→In forward bias, the width of potential barrier in a P-N junction diode