Electric Charge...

The electric field at a point $$2$$cm from an infinite line charge of linear charge density $$10^{-7}$$ $$Cm^{-1}$$ is?

The total solid angle subtended by the sphere is

A rod of length l having charge q uniformly distributed moves towards right with constant speed v. At $$t=0$$, it enters in an imaginary cube of edge $$I/2$$, sketch variation of electric flux passing through the cube with respect to time.

Which of the following curves shown cannot possibly represent electrostatic field lines?

Two small spheres are charged positively, the combined charge being $$5.0 \times 10^{-5} C$$. If each sphere is repelled from in other by a force of 1.0 N when the spheres are 2.0 metre apart, how is the total charge distributed between the spheres?

Under the action of a given coulombic force the acceleration of an electron is $$\times { 10 }^{ 22 }m\quad { s }^{ -2 }$$. Then the magnitude of the acceleration of a proton under the action of same force is nearly

A proton is kept at rest. A positively charged particle is released from rest at a distance $$d$$ in its field. Consider two experiments; one in which the charged particle is a proton and in another a positron. In the same time $$t$$, the work done on the two moving charged particles is

A field of $$100V{ m }^{ -1 }$$ is directed at $${30}^{o}$$ to positive x-axis. Find $$\left( { V }_{ A }-{ V }_{ B } \right) $$ if $$OA=2m$$ and $$OB=4m$$.

Two identical small bodies each of mass $$m$$ and charge $$q$$ are suspended from two strings each of length $$l$$ from a fixed point. This whole system is taken into an orbiting artificial satellites, then find the tension in strings

Two point charges separated by a distance $$d$$ repel each with a force of $$9N.$$ If the separation between them becomes $$3d,$$ the force repulsion will be