Moving Charges ...

Two wires A & B are carrying currents $$I_1$$ & $$I_2$$  as shown in the figure. The separation between them is $$d$$. A third wire C carrying a current $$I$$ is to be kept parallel to them at a distance x from A such that the net force acting on it is zero. The possible values of x are :

The correct Biot-Savart law in vector form is?

Which of the following gives the value of magnitude field according to, Biot-Savart's law'

An electron, a proton and a $$He^+$$ ion projected into a magnetic field with same kinetic energy, with velocities being perpendicular to the magnetic field. The order of the radii of cirlces traced by them is:

A long straight wire carries a current of $$50\, A$$. An electron moving at $$10^7\, m/s$$ is $$5\, cm$$ away from the wire. The force acting on electron if its velocity is directed towards the wire will be :

A stationary magnet does not intereact with 

 A particle of charge $$ 1 \mu C $$ is at rest in a magnetic field $$ \overrightarrow {B} = -2 \overrightarrow {k} $$ tesla,Magnetic Lorentz force on the charge particle with respect to an observer moving with velocity $$ \overrightarrow {v} = -5 \hat {i} ms^{-1} $$ will be 

A point charge $$q$$ is placed near a long straight wire carrying current $$I$$, then :

If a long copper and carries a direct current, the magnetic field due to current will be :

In moving coil galvanometer, strong horses shoe magnet of concave shaped pole pieces is used to?