When a proton is accelerated through 1V its kinetic energy will be: [AIPMT 1999]

A charged wire is bent in the form of a semi-circular arc of radius a. If charge per unit length is \[\lambda \] coulomb/metre, the electric field at the centre O is:

A capacitor is charged by connecting a battery across its plates. It stores energy U. Now the battery is disconnected and another identical capacitor is connected across it, then the energy stored by both capacitors of the system will be: [AIPMT 2000]

The reactance of a capacitor of capacitance C is X. If both the frequency and capacitance be doubled, then new reactance will be: [AIPMT 2001]

A man goes at the top of a smooth inclined plane. He releases a bag to fall freely and he himself slides on inclined plane to reach the bottom. If \[{{v}_{1}}\] and \[{{v}_{2}}\] are the velocities of the man and bag respectively, then: [AIPMT 2000]

A point Q lies on die perpendicular bisector of an electrical dipole of dipole moment p. If the distance of Q from the dipole is r (much larger than the size of the dipole) then electric field at Q is proportional to: [AIPMT 1998]

A particle of mass m and charge q is placed at rest in a uniform electric field E and then released. The kinetic energy attained by the particle after moving a distance y is : [AIPMT 1998]

A hollow insulated conducting sphere is given a positive charge of \[10\,\mu C\]. What will be the electric field at the centre of the sphere if its radius is 2 m? [AIPMT 1998]

When air is replaced by a dielectric medium of constant K, the maximum force of attraction between two charges, separated by a distance: [AIPMT 1999]

A series combination of n1 capacitors, each of value \[{{C}_{1}},\] is charged by a source of potential difference 4V. When another parallel combination of \[{{n}_{2}}\] capacitors, each of value \[{{C}_{2}},\] is charged by a source of potential difference V, it has the same (total) energy stored in it, as the first combination has. The value of \[{{C}_{2}},\] in terms of \[{{C}_{1}},\] is then [AIPMT (S) 2010]

Two parallel metal plates having charges \[+Q\] and \[-Q\] face each other at a certain distance between them. If the plates are now dipped in kerosene oil tank, the electric field between the plates will [AIPMT (M) 2010]

The electric field at a distance \[\frac{3R}{2}\] from the centre of a charged conducting spherical shell of radius R is E. The electric field at a distance \[\frac{R}{2}\] from the centre of the sphere is [AIPMT (M) 2010]

The electric potential V at any point \[(x,y,z),\] all in metres in space is given by \[V=4{{x}^{2}}\] volt. The electric field at the point \[(1,0,2)\] in volt/metre is [AIPMT (M) 2011]

Three charges, each \[+q,\] are placed at the comers of an isosceles triangle ABC of sides Be and AC, 2a. D and E are the mid points of Be and CA. The work done in taking a charge Q from D to E is [AIPMT (M) 2011]

Four point charges \[-Q,\,-q,\text{ }2q\] and \[2Q\] are placed, one at each comer of the square. The relation between Q and q for which the potential at the centre of the square is zero, is [AIPMT(S) 2012]