Download App

Electromagnetic Induction — Physics STD 12 Science — Question

Gujarat 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

Physics STD 12 Science question papers→Gujarat Board STD 12 Science question papers→Gujarat Board question paper generator→

Similar questions

Obtain the first Bohr’s radius and the ground state energy of a muonic hydrogen atom [i.e., an atom in which a negatively charged muon $(\mu)$ of mass about $207m_e$ orbits around a proton].
→
Find the energy, the frequency and the momentum of an X-ray photon of wavelength 0.10nm.
→
Prove that the structure of helium and oxygen nuclei is more stable than that of deuterium nuclei.
→
What is drift velocity? Explain the dependence of drift velocity and electric field on the mobility.
→
A charge of $+2.0 \times 10^{-8}C$ is placed on the positive plate and a charge of $-1.0 \times 10^{-8}C$ on the negative plate of a parallel-plate capacitor of capacitance $1.2\times10^{-3}\mu\text{F}.$ Calculate the potential difference developed between the plates.
→
Consider a two$-$slit interference arrangements $($Figure$)$ such that the distance of the screen from the slits is half the distance between the slits. Obtain the value of $D$ in terms of $\lambda$ such that the first minima on the screen fall at a distance $D$ from the center $O. $​​​​​​​
Image
→
Figure, shows an aluminium rod joined to a copper rod. Each of the rods has a length of 20cm and area of cross section $0.20cm^2$. The junction is maintained at a constant temperature $40^\circ C$ and the two ends are maintained at $80^\circ C.$ Calculate the amount of heat taken out from the cold junction in one minute after the steady state is reached. The conductivities are KAI ${= 200wm^{-1}}{^\circ C^{-1}}$ and ${K_{cu} = 400wm^{-1}}^\circ C^{-1}.$
→
Consider the situation of the previous problem. Find the average electric field energy stored in the capacitor and the average magnetic field energy stored in the coil.
→
Why are alloys used for making standard resistance coils?
→
The magnetic field of a beam emerging from a filter facing a floodlight is given by $B_0 = 12 \times 10^{-8}\sin (1.20 \times 10^7z - 3.60 \times 10^{15}t) T.$ What is the average intensity of the beam?
→