Two long wires each oflength I are placed on a smooth horizontal table. Wires have equal but opposite charges. Magnitude oflinear charge density on each wire is `lambda`. Calculate the work required to increase the separation between the wires from a to 2a:

Two long wires are placed on a smooth horizontal table. The linear charge densities of these wires are +- lambda C//m . For unit length of the wires, calculate the work requrired to increase the separation between the wires from a to 3a.

A tiny electric dipole of dipole moment p is palced at a distance r from an infinitely long wire, with its vecp normal to the wire. If the linear charge density of the wire is lambda , the electrostatic force acting on the dipole is equal to

The length of a straight thin wire is 2 m. It is uniformly charged with a positive charge of 3 mu C .Calculate : The charge density of the wire .

Two parallel straight long conducting wires, which are placed at a distance r from each other, are carrying equal currents I in opposite directions. The value of magnetic induction at a point situated at a point situated x from one wire in between the wires will be:

Two long wires having linear charge density lamda and - lamda are placed parallel to each other at separation ras shown in the figure. The electric field at point P will be

Figure shows a long wire having uniform charge density lambda as shown in figure. Calculate electric field intensity at point P.