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.

What is the relation between Gauss and Tesla?

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

What do you understand by the oersted experiment?

A current carrying conductor cannot produce magnetic field. 

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

Which field is produced by a moving charge.

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:

A metal coil of area $A,$ number of turns $n,$ mass $m$ and resistance $r$ is lying in a horizontal plane. A uniform time varying magnetic field is set-up to pass vertically through the coil at time $t=0$. The field is first increased from $0$ to $B_0$ at a constant rate in time $t_0$ and then decreased from $B_0$ to zero in the same time $t_0$. If the cycle is repeated continuously, then the correct graph(s) representing the variation of current and power dissipated with time $\left(t\right)$ is/are