MCQ
The magnetic field energy in an inductor changes from maximum value to minimum value in $5.0ms$ when connected to an $AC$ source. The frequency of the source:
- A$20Hz.$
- ✓$50Hz$.
- C$200Hz.$
- D$500Hz.$
✓
Answer
Correct option: B.
$50Hz$.
Frequency of the source is remain constant $= 50Hz.$
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
A magnet of magnetic moment $50\,\hat i\,A{\rm{ - }}{m^2}$ is placed along the $x-$ axis in a magnetic field $\overrightarrow B = (0.5\,\hat i + 3.0\hat j)\,T.$ The torque acting on the magnet is
→The focal length of objective and eye lens of a microscope are $4\, cm$ and $8\, cm$ respectively. If the least distance of distinct vision is $24 \,cm$ and object distance is $4.5 \,cm$ from the objective lens, then the magnifying power of the microscope will be
→An electron (mass $= 9 \times 10^{-31}\,kg$. Charge $= 1.6 \times 10^{-19}\,C$) whose kinetic energy is $7.2 \times 10^{-18}$ $joule$ is moving in a circular orbit in a magnetic field of $9 \times 10^{-5} \,weber/m^2$. The radius of the orbit is.....$cm$
→Near and far points of a human eye are
In the Bohr 's model of hydrogen-like atom the force between the nucleus and the electron is modified as $F = \frac{{{e^2}}}{{4\pi {\varepsilon _0}}}\left( {\frac{1}{{{r^2}}} + \frac{\beta }{{{r^3}}}} \right)$, where $\beta $ is a constant. For this atom, the radius of the $n^{th}$ orbit in terms of the Bohr radius $\left( {{a_0} = \,\frac{{{\varepsilon _0}{h^2}}}{{m\pi {e^2}}}} \right)$ is
→$STATEMENT$ $-1$ The formula connecting $\mathrm{u}, \mathrm{v}$ and $\mathrm{f}$ for a spherical mirror is valid only for mirrors whose sizes are very small compared to their radii of curvature. because
→$STATEMENT$ $-2$ Laws of reflection are strictly valid for plane surfaces, but not for large spherical surfaces.
A planet which is born sister of earth is
A diffraction pattern is obtained by using beam of red. light what will happen, if red light is replced by the blue light ?
In the given circuit diagram, the currents, ${I_1} = - \,0.3\,A,\,{I_4} = 0.8\,A$ and ${I_5} = 0.4\,A,$ are flowing as shown. The currents $I_2,\,I_3$ and $I_6,$ respectively are
→A thin wire of length $l$ is carrying a constant current. The wire is bent to form a circular coil. If radius of the coil, thus formed, is equal to $R$ and number of turns in it is equal to $n$, then which of the following graphs represent $(s)$ variation of magnetic field induction $(b)$ at centre of the coil
→