k=(1)/(4 pi epsilon_(0))=?

A ring of radius 3 m has charge density lambda . Electric potential at 4 m from its centre on its axis is ____ [k=(1)/(4pi epsilon_(0))]

A ring of radius 3 m has charge density lambda . Electric potential at 4 m from its centre on its axis is ____ [k=(1)/(4pi epsilon_(0))]

The magnitude of electric field intensity at point B(2,0,0) due to dipole of dipole moment, vec(p)=hat(i)+sqrt(3)hat(j) kept at origin is (assume that the point B is at large distance from the dipole and k=(1)/(4pi epsilon_(0)))

The magnitude of electric field intensity at point B(2,0,0) due to dipole of dipole moment, vec(p)=hat(i)+sqrt(3)hat(j) kept at origin is (assume that the point B is at large distance from the dipole and k=(1)/(4pi epsilon_(0)))

A metal sphere of radius 'a' is having charge +Q . Now it is connected by a conducting wire concentric spherical shell of radius '2a'. Then the potential at the surface of outer shell is Here, K=(1)/(4pi epsilon_(0))

A metal sphere of radius 'a' is having charge +Q . Now it is connected by a conducting wire concentric spherical shell of radius '2a'. Then the potential at the surface of outer shell is Here, K=(1)/(4pi epsilon_(0))

Electric potential inside hollow charged sphere of radius .r. is ______ [k = (1)/(4pi epsilon_(0))]