Question
A magnet is made to oscillate with a particular frequency, passing through a coil as shown in figure. The time variation of the magnitude of $e.m.f$. generated across the coil during one cycle is
✓
Answer
(a) when north pole of magnet approaches the one face of coil, then the force of the coil becomes a north pole to oppose this motion and current flows anticlockwise thus, in this case emf is developed in the coil and when it completes on half motion it is momentarily at rest and no emf is present. now south pole approaches the current mow flows in clockwise direction and again an emf is developed in the coil. this variation is shown in figure.
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
An electron of stationary hydrogen atom passes from the fifth energy level to the ground level. The velocity that the atom acquired a result of photon emission will be
A nucleus disintegrates into two nuclear parts, in such a way that ratio of their nuclear sizes is $1: 2^{1 / 3}$.Their respective speed have a ratio of $n: 1$. The value of $n$ is $.....$.
→The escape velocity of a rocket launched from the surface of the earth
An $npn$ transistor operates as a common emitter amplifier with a power gain of $10^{6} .$ The input circuit resistance is $100\, \Omega$ and the output load resistance is $10\, K \Omega$. The common emitter current gain ' $\beta$ ' will be............. (Round off to the Nearest Integer)
→Under a constant pressure head, the rate of flow of liquid through a capillary tube is $V$. If the length of the capillary is doubled and the diameter of the bore is halved, the rate of flow would become
→The position $x$ of a particle with respect to time $t$ along $x-$ axis is given by $x = 9{t^2} - {t^3}$ where $x$ is in metres and $t$ in seconds. What will be the position of this particle when it achieves maximum speed along the $x$ direction ? $..........\ m$
→Adjacent figure shows the force-displacement graph of a moving body, the work done in displacing body from $x = 0$ to $x = 35\,m$ is equal to ........... $J$
→A projectile is projected with speed $u$ of an angle of $60^o$ with horizontal from the foot of an inclined plane. If the projectile hits the inclined plane horizontally, the range on inclined plane will be :-
→The frequency of the sinusoidal wave $y = 0.40\cos [2000\,t + 0.80\,x]$ would be
→Effective capacitance of parallel combination of two capacitors $\mathrm{C}_{1}$ and $\mathrm{C}_{2}$ is $10\; \mu \mathrm{F}$. When these capacitors are individually connected to a voltage source of $1\; \mathrm{V},$ the energy stored in the capacitor $\mathrm{C}_{2}$ is $4$ times that of $\mathrm{C}_{1}$. If these capacitors are connected in series, their effective capacitance will be
→