A spherical conductor is charged up to a potential of 450 V . The potential outside, at a distance 15 cm from the surface, is 300 V . Then

Options

1. Athe potential at 15 cm from the center is 900 V
2. Bthe charge on the conductor is 1.5 nC
3. Cthe electric field just outside the surface is 150 ~N / C
4. Dthe total electrical energy of the conductor is U=3.375 J