Moving Charges ...

A $25cm$ long solenoid has radius $2cm$ and $500$ total number of turns. It carries a current of $15A$. If it is equivalent to a magnet of the same size and magnetization $\overrightarrow { M }$ (magnetic moment/volume), then $\left| \overrightarrow { M }  \right|$ is:

Two parallel wires in free space are $10cm$ apart and cach carries a current of 10 $\mathrm{A}$ in the same direction. The magnetic force per unit length of cach wire is.

A particle having the same charge as of electron moves in a circular path of radius 0.5 cm under the influence of a magnetic field of 0.5 T. If an electric field of 100 V/m makes it move in a straight path, then the mass of the particle is ___?
(Given charge of electron = $1.6 \times 10^{-19} C$)

An electron moves with velocity $v$ in uniform traverse magnetic field $B$ on circular path of radius $'r'$, then $e/m$ for it is 

Which of following cannot be deflected by magnetic field

Two parallel infinite wires separated by distance $'d'$ carry currents as shown in figure.
The distance from a third infinite wire be kept parallel to wire carrying current $l_1$, the wire such that it stays in equilibrium is

A moving coil galvanometer, having a resistance $G$, produces full scale deflection when a current $I_g$ flows through it. This galvanometer can be converted into (i) an ammeter of range $0$ to $I_0 (I_0 > I_g)$ by connecting a shunt resistance $R_A$ to it and (ii) into a voltmeter of range $0$ to $V(V = GI_0)$ by connecting a series resistance $R_V$ to it. Then

Using Kirchhoff's current law and Ohm's law. Find the magnitude of voltage V ( In volt) direction of current is as shown  in  figure 

A particle of charge -q and mass m enters a uniform magnetic field $\overrightarrow B$ at A with speed $v_1$ at an angle $\alpha$ and leaves the field at C with speed $v_2$ at an angle $\beta$ as shown . then