Download App

Electromagnetic Induction — Physics STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 SciencePhysicsElectromagnetic Induction3 Marks
Question
The current generator $I_g$ shown in figure, sends a constant current i through the circuit. The wire cd is fixed and ab is made to slide on the smooth, thick rails with a constant velocity $v$ towards right. Each of these wires has resistance r. Find the current through the wire cd.
✓

Answer



Initial current passing $= i$
Hence initial emf $= ir$
Emf due to motion of ab $= Blv$
Net emf $= ir - Blv$
Net resistance $= 2r$
Hence current passing $=\frac{\text{ir}-\text{Blv}}{2\text{r}}$

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "3 Marks Question" from Electromagnetic Induction→Electromagnetic Induction — all question types→Physics STD 12 Science question papers→Rajasthan Board STD 12 Science question papers→Rajasthan Board question paper generator→

Similar questions

  1. Consider an arbitrary electrostatic field configuration. A small test charge is placed at a null point (i.e., where E = 0) of the configuration. Show that the equilibrium of the test charge is necessarily unstable.
  2. Verify this result for the simple configuration of two charges of the same magnitude and sign placed a certain distance apart.
→
Define the different terms used for the composition of a nucleus.
→
A current loop of arbitrary shape lies in a uniform magnetic field $B.$ Show that the net magnetic force acting on the loop is zero.
→
A pair of adjacent coils has a mutual inductance of $1.5H.$ If the current in one coil changes from $0$ to $20A$ in $0.5s,$ what is the change of flux linkage with the other coil?
→
Three identical metal plates with large surface areas are kept parallel to each other as shown in figure. The leftmost plate is given a charge Q, the rightmost a charge -2Q and the middle one remains neutral. Find the charge appearing on the outer surface of the rightmost plate.
→
In a Geiger - Marsden experiment, calculate the distance of closest approach to the nucleus of Z = 80, when an α-particle of 8 MeV nergy impinges on it before it comes momentarily to rest and reverses its direction.
How will the distance of closest approach be affected when the kinetic energy of the α-particle is doubled?
→
Figure shows a rough track, a portion of which is in the form of a cylinder of radius R. With what minimum linear speed should a sphere of radius r be set rolling on the horizontal part so that it completely goes round the circle on the cylindrical part.
→
Locate the image of the point P as seen by the eye in the figure.
→
What is Peltier effect ?
→
A sinusoidal voltage of peak value $283 V$ and frequency $50 Hz$ is applied to a series $L C R$ circuit in which $R =3 \Omega, L=25.48 mH$, and $C =796 \mu F$. Find (a) the impedance of the circuit; (b) the phase difference between the voltage across the source and the current; (c) the power dissipated in the circuit; and (d) the power factor.
→