Download App

Moving Charges and Magnetism — Physics STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsMoving Charges and Magnetism2 Marks
Question
In Ampere's $\oint\overrightarrow{\text{B}}.\text{d}\overrightarrow{\text{l}}=\mu_0\text{i},$ the current outside the curve is not included on the right hand side. Does it mean that the magnetic field B calculated by using Ampere's law, gives the contribution of only the currents crossing the area bounded by the curve?
✓

Answer

In Ampere's law $\oint\overrightarrow{\text{B}}.\text{d}\overrightarrow{\text{l}}=\mu_0\text{i},$ is the total current crossing the area bounded by the closed curve. The magnetic field B on the left-hand side is the resultant field due to all existing currents.

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 "2 Marks Questions" from Moving Charges and Magnetism→Moving Charges and Magnetism — all question types→Physics STD 12 Science question papers→Gujarat Board STD 12 Science question papers→Gujarat Board question paper generator→

Similar questions

A wire, carrying a current i, is kept in the x−y plane along the curve $\text{y}=\text{A}\sin\Big(\frac{2\pi}{\lambda}\text{x}\Big).$ A magnetic field B exists in the z direction. Find the magnitude of the magnetic force on the portion of the wire between $\text{x}=0$ and $\text{x}=\lambda.$
→
A conducting circular loop of radius a is connected to two Iong, straight wires. The straight wires carry current I as shown in figure. Find the magnetic field B at the centre of the loop.
→
An electron accelerated by 1 kV travels 5 km towards conducting plate of infinite extension is moving in the direction perpendicular to the plate. Calculate the minimum surface charge density on the conducting plate so that the electron cannot collide with the plate.
→
Can you think of two particles which do not exert gravitational force on each other?
→
Obtain the de Broglie wavelength of a neutron of kinetic energy 150 eV . As you have seen in Exercise 11.31, an electron beam of this energy is suitable for crystal diffraction experiments. Would a neutron beam of the same energy be equally suitable? Explain. $( \left.\mathrm{m}_{\mathrm{n}}=1.675 \times 10^{-27} \mathrm{~kg}\right)$.
→
Write a short note on Ultra violet rays.
→
Two crystals $C _1$ and $C _2$, made of pure silicon, are doped with arsenic and aluminium respectively.
a. Identify the extrinsic semiconductors so formed.
b. Why is doping of intrinsic semiconductors necessary?
→
Two charges 2 µC and –2 µC are placed at points A and B 6 cm apart.
  1. Identify an equipotential surface of the system.
  2. What is the direction of the electric field at every point on this surface?
→
Prove that $\varepsilon_0 \mu_0=\frac{1}{c^2}\left(\right.$ or $\left.c=\frac{1}{\sqrt{\varepsilon_0 \mu_0}}\right)$. ###
Derive the relation between the permittivity of free space $\left(\varepsilon_0\right)$, the permeability of free space $\left(\mu_0\right)$ and the speed of light $(c)$.
→
Explain current sensitivity and voltage sensitivity of galvanometer.
→