Euipotential surfaces in a region of electric field are shaped as shown in the figure. The potential of field lines is increasing as one moves to right. A thin beam of electrons enters the region from left along the axis. Give qualitative arguments to show that the region will act as an electrostatic lens trying to focus the beam of electrons.

An electron beam enters a magnetic field right angles to it as shown in the Figure. The direction of force acting on the electron beam 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 uniform electric field and a uniform magnetic field are acting along the same direction in a certain region. If an electron is projected in the same direction then the electron

An electron beam with equivalent electric current I enters a region of crossed electric field and magnetic field B. Both the fields are uniform. It is found that the electron beam goes undeviated through the region of fields. After passing the field region, electrons hit a grounded target. How much force is exerted by the electron beam on urget? Assumem is the mass of electron and e its charge.

A uniform magnetic field exists in the plane of paper pointing from left to right as shown in figure. In the field, an electron and a proton move as shown. The electron and the proton experience:

In an electric field region, the electric potential varies along the x-axis as shown in the graph. The x components of the electirc field in the regions for the intervals PQ and QR as market in the garph, in N//C , are respectively: