Moving Charges ...

The work done by a magnetic field, on a moving charge is

Two infinite long wires, each carrying current $$I$$, are lying along x-axis and y-axis, respectively. $$A$$ charged particle, having a charge $$q$$ and mass $$m$$, is projected with a velocity $$u$$ along the straight line $$OP$$. The path of the particle is (neglect gravity) a:

A positively charged particle moving due east enters a region of uniform magnetic field directed vertically upwards. This particle will

If an electron describes half a revolution in a circle of radius r in a magnetic field B, the energy acquired by it is

Through two parallel wires A and B, 10A and 2A of currents are passed respectively in opposite directions. If the wire A is infinitely long and the length of the wire B is 2m, then force on the conductor B, which is situated at 10 cm distance from A, will be

Only the current inside the Amperian loop contributes in

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

Two thin long parallel wires separated by a distance $$b$$  are carrying a current $$I$$ ampere each. The magnitude of the force per unit length exerted by one wire on the other is

There wires are situated at the same distance. A current of $$1\ A$$, $$2\ A$$, $$3\ A$$ flows through these wires in the same direction. What is ratio $$F_1/ F_2$$ where $$F_1$$ is force on $$1$$ and $$F_2$$ on $$2$$?

An electron travelling with a speed u along the positive x-axis enters into a region of magnetic field where $$B=-B_0 \hat k(x > 0)$$. It comes out of the region with speed v. Then