Download App

Moving Charges and Magnetism — Physics STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsMoving Charges and Magnetism2 Marks
Question
State Biot-Savart law.A current I flows in a conductor placed perpendicular to the plane of the paper.Indicate the direction of the magnetic field due to a small element d $\overrightarrow{l}$at point P situated at a distance $ \overrightarrow{r}$ from the element as shown in the figure.
✓

Answer

Statement of Biot - Sarvat Law:$\text{d}\overrightarrow{\text{B}}$ varies as $\frac{\text{I}\big(\text{d}\overrightarrow{l}\times\overrightarrow{r}\big)}{\text{r}^{3}}$
Direction of Magnetic field at point P is along negative x-axis.
Alternate Answer
Directed in the plane of page along the negative X direction.

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 bar magnet is kept in a uniform magnetic field such that its magnetic moment is at an angle with the direction of $\overrightarrow{ B }$. Write an expression for potential energy of this system. When it will be minimum?
→
A potential difference $V$ is applied across the ends of a conductor of length $L$ and diameter $D$. What will be the effect on drift velocity of charge carriers in the conductor when (i) V is made half (ii) L is doubled and (iii) D is made half?
→
The instantaneous voltage from an ac source is given by $\text{E}=300\sin314\text{t};$ what is the rms voltage of the source.
→
The potential difference across the terminals of a battery of emf 12V and internal resistance $2\Omega$ drops to 10V when it is connected to a silver voltameter. Find the silver deposited at the cathode in half an hour. Atomic weight of silver is 107.9g/mole.
→
A galvanometer cannot be used directly to measure current - why ? Explain the solution of this problem.
###
State the difficulties occured and their solution when galvanometer is directly used as ammeter.
→
An electron beam passes through a region of crossed electric and magnetic fields of strength E and B respectively. For what value of electron-speed the beam will remain undeflected?
→
A copper wire bent in the shape of a semicircle of radius r translates in its plane with a constant velocity v. A uniform magnetic field B exists in the direction perpendicular to the plane of the wire. Find the emf induced between the ends of the wire if:
  1. The velocity is perpendicular to the diameter joining free ends.
  2. The velocity is parallel to this diameter.
→
If we walk barefoot on a nylon mat for some time and touch the metal handle of a door, we get an electric shock. Why does this happen?
→
The contact angle between pure water and pure silver is $90^\circ$. If a capillary tube made of silver is dipped at one end in pure water, will the water rise in the capillary?
→
Monochromatic light of frequency $6.0 \times 10^{14} Hz$ is produced by a laser. The power emitted is $2.0 \times 10^{-3} W$. (a) What is the energy of a photon in the light beam? (b) How many photons per second, on an average, are emitted by the source?
→