A potential difference of $600 \mathrm{V}$ is applied across the plates of a parallel plate condenser. Tile between the plates in $3 \mathrm{mm}$. An electron projected vertically, parallel to the plates, with a velocity of $2\times {10}^6 \mathrm{m}/\mathrm{s}$ moves undeleted between the plates, Fig. Find the magnitude and direction of the magnetic field in the region between the condenser plates [Neglect the edge effects] 

 

A rectangular loop of wire of sign $2.5 \mathrm{cm}\times 4 \mathrm{cm}$ carries a steady current of $1 \mathrm{A}$. A straight wire carrying $2 \mathrm{A}$ current is kept near the loop as shown, Fig.  If the loop and the wire are coplanar, find the torque acting on the loop.

A rectangular loop of wire of sign $2.5 \mathrm{cm}\times 4 \mathrm{cm}$ carries a steady current of $1 \mathrm{A}$. A straight wire carrying $2 \mathrm{A}$ current is kept near the loop as shown, Fig. If the loop and the wire are coplanar, find the magnitude and direction of the force on the loop due to the current carrying wire.

Two long straight parallel wires are $2 \mathrm{m}$ apart, perpendicular to the plane of the paper, Fig. The wire A carries a current of $9.6 \mathrm{A}$, directed into the plane of the paper. The wire $\mathrm{B}$ carries a current such that the magnetic field of induction at the point $P$, at distance $\frac{10}{11} \mathrm{m}$ from the wire $\mathrm{B}$ is zero. Find The magnitude and direction of the current in $\mathrm{B}$. 

Two long straight parallel wires are $2 \mathrm{m}$ apart, perpendicular to the plane of the paper, Fig. The wire $\mathrm{A}$ carries a current of $9.6 \mathrm{A}$, directed into the plane of the paper. The wire $\mathrm{B}$ carries a current such that the magnetic field of induction at the point $\mathrm{P}$, at distance $\frac{10}{11} \mathrm{m}$ from the wire $\mathrm{B}$ is zero. Find The magnitude of the magnetic field of induction at the point $\mathrm{S}$

Two long straight parallel wires are $2 \mathrm{m}$ apart, perpendicular to the plane of the paper, Fig. The wire A carries a current of $9.6 \mathrm{A}$, directed into the plane of the paper. The wire $\mathrm{B}$ carries a current such that the magnetic field of induction at the point $\mathrm{P}$, at distance $\frac{10}{11} \mathrm{m}$ from the wire $\mathrm{B}$ is zero. Find The force per unit length on the wire $\mathrm{B}$.