Magnetic Effects of Current — JEE Main PYQs

A long solenoid has 200 turns per cm and carries a current i. The magnetic field at its centre is $6.28\times 10^{-2}$ Weber $/{\mathrm{m}}^2$. Another long solenoid has 100 turns per cm and it carries a current $\mathrm{i}/3$. The value of the magnetic field at its centre is

Two thin, long parallel wires separated by a distance '$d$' carry a current of '$i$' $A$ in the same direction. They will

Two concentric coils each of radius equal to $2\pi \mathrm{cm}$ are placed at right angles to each other. 3 Ampere and 4 ampere are the currents flowing in each coil respectively. The magnetic induction in Weber $/{\mathrm{m}}^2$ at the centre of the coils will be ( …

A uniform electric field and a uniform magnetic field are acting along the same direction in a certain region. If an electron is projected along the direction of the fields with a certain velocity then

A charged particle of mass $m$ and charge $q$ travels on a circular path of radius $r$ that is perpendicular to a magnetic field B. The time taken by the particle to complete one revolution is

A current I ampere flows along an infinitely long straight thin walled tube, then the magnetic induction at any point inside the tube is

A long wire carries a steady current. It is bent into a circle of one turn and the magnetic field at the centre of the coil is B. It is then bent into a circular loop of n turns. The magnetic field at the centre of the coil will be

The magnetic field due to a current carrying circular loop of radius 3 cm at a point on the axis at a distance of 4 cm from the centre is $54\mu T$. What will be its value at the centre of the loop?

Two long conductors, separated by a distance $d$ carry current $I_1$ and $I_2$ in the same direction. They exert a force F on each other. Now the current in one of them increased to two times and its direction reversed. The distance is also increased to 3d. The new value of t …