Magnetic Field

A beam of  $\alpha$  particles projected along +x – axis, experiences a force due to a magnetic field along the +y – axis. What is the direction of the magnetic field?
 

An electron moves around the nucleus in a hydrogen atom of radius $0.51 \stackrel{\circ }{\mathrm{A}}$, with a velocity of  $2\times {10}^5 \mathrm{m} {\mathrm{s}}^{-1}$. Calculate the following :

(i) The equivalent current due to orbital motion of electron.

(ii) The magnetic field produced at the centre of the nucleus.

(iii) The magnetic moment associated with the electron.

A small current element $i\mathrm{d}\overrightarrow{\mathit{l}}$ with $\mathrm{d}\overrightarrow{l}=2\hat{\mathrm{k}} \mathrm{mm}$ and $I=2 \mathrm{A}$ is centred at the origin. The direction of the magnetic field at position $6 \mathrm{m}$ Westward from the origin will be

In the given figure at point $\mathrm{P}$. what is the direction of magnetic field.

An element $∆\overrightarrow{\mathrm{i}}=∆\mathrm{y}\hat{\mathrm{j}}$ is placed at the origin and carries current $\mathrm{i}$ then magnetic field at distance $0.2 \mathrm{m}$ on $+\mathrm{z}-$ axis will be pointing towards

A current carrying wire is along north-east direction and position vector $\left(\overrightarrow{\mathrm{r}}\right)$ is along outward to the plane of paper. Direction of magnetic field will be

How direction of magnetic field is identified? explain.

A vector perpendicular to $\hat{i}+\hat{j}+\hat{k}$

The magnetic field created at the nucleus by the revolving electron in the second excited state of $\mathrm{H}-$atom is $B$. The field created by the electron in the ground state in such an atom will be-

Direction of magnetic field at point $P,$ due to current carrying wire will be (two quarter circle lie in $xy$ and $yz$ plane centred at $P$)

Select the material(s) which are required for Oersted experiment.

Two long parallel wires $\mathrm{P}$ and $\mathrm{Q}$ are both perpendicular to the plane of the paper with distance of $5 \mathrm{m}$ between them. If $\mathrm{P}$ and $\mathrm{Q}$ carry current of $2.5$ amp and $5$ amp respectively in the same direction, then the magnetic field at a point half-way between the wires is

A magnetic field can be produced by:-

The circuit is normal to a magnetic field of $B=0.15 \mathrm{T}$ as shown in the figure. Find the force required to move the rod of resistance $3 \mathrm{\Omega }$ with a constant velocity of $2 \mathrm{m}/\mathrm{s}$. 

A current $I$ flows along a triangular loop having sides of equal length $a$. What should be the strength of magnetic field at the centre of the loop?

The magnetic field $B$ produced at the centre of a square current loop of side length $L$ kept in $x$ - $y$ plane carrying a current $I$ is given by

The magnetic field inside a solid conducting long wire at distance r from its axis is given as $B=B_0{r}^3$ where $B_0$ is constant. Which of the following relations correctly represents current enclosed in the loop of radius r shown in figure:

What is the magnetic field at point $P$ if wire (infinite) is bent at $90^{\mathrm{o}}$ and current is flowing through it in opposite direction at point O:

An ideal solenoid having 5000 turns/m has an aluminium core and carries a current of 5A. If ${\chi }_{Al}=2.3\times {10}^{-5}$ , then the magnetic field developed at centre will be

Magnetic field: