Two metallic spheres of radii $1\mathrm{cm}$ and $3\mathrm{cm}$ are given charges of $-1\times {10}^{-2} C$ and $5\times {10}^{-2} C$ respectively. If these are connected by a conducting wire, the final charge on the bigger sphere is:

$A,B$ and $C$ are three points in a uniform electric field. The electric potential is:

A dipole of dipole moment 'p' is placed in a non-uniform electric field along x-axis. Electric field is increasing at the rate of 1 V/m² then the force on dipole is :-