Magnetic Effects of Current

Following figures show the arrangement of bar magnets in different configurations. Each magnet has magnetic dipole $\vec{m}.$ Which configuration has highest net magnetic dipole moment?

Two identical long conducting wires $AOB$ and $COD$ are placed at right angle to each other, with one above other such that ' $O$ ' is their common point for the two. The wires carry $I_{1}$ and $I_{2}$ currents,…

A very long conducting wire is bent in a semi- circular shape from $A$to $B$ as shown in figure. The magnetic field at point$P$ for steady current configuration is given by:

A cylindrical conductor of radius$R$ is carrying a constant current. The plot of the magnitude of the magnetic field$B$ with the distance $d$ from the centre of the conductor is correctly represented by the figure?

An arrangement of three parallel straight wires placed perpendicular to plane of paper carrying same current $I$ along the same direction is shown in Figure. Magnitude of force per unit length on the middle wire $B$ is…

An infinitely long straight conductor carries a current of $5A$as shown. An electron is moving with a speed of $10^{5}ms^{-1}$parallel to the conductor. The perpendicular distance between the electron and the conductor…

In the product $\vec{F}=q(\vec{v}\times\,\vec{B})$ $=q\vec{v}\times\,\left(B\hat{i}+B\hat{j}+B_{0}\hat{k}\right)$ For $q=1$ and $\vec{v}=2\hat{i}+4\hat{j}+6\hat{k}$ and $\vec{F}=4\hat{i}-20\hat{j}+12\hat{k}$ What will…

A long wire carrying a steady current is bent into a circular loop of one turn. The magnetic field at the centre of the loop is $B.$ It is then bent into a circular coil of $n$ turns. The magnetic field at the centre of…

A square loop of area$25cm^{2}$has a resistance of$10\Omega$. The loop is placed in uniform magnetic field of magnitude$40.0T$. The plane of loop is perpendicular to the magnetic field. The work done in pulling the loop…

Two bar magnets oscillate in a horizontal plane in earth's magnetic field with time periods of$3s$ and$4s$respectively. If their moments of inertia are in the ratio of$3:2$ then the ratio of their magnetic moments will…

Assertion : Magnetic lines forms closed loops in nature. Reason : Mono-magnetic pole does not exist in nature.

The figure given below shows a long straight solid wire of circular cross-section of radius '$a$' carrying steady current $I$. The current $I$ is uniformly distributed across its cross-section. The plot which correctly…