A charge of `+1C` is placed at the centre of a spherical shell of radius 10cm. What will be the work

A charge of `+1C` is placed at the centre of a spherical shell of radius 10cm. What will be the work

A charge of `+1C` is placed at the centre of a spherical shell of radius 10cm. What will be the work done in moving a charge of `+1 muC` on its surface through a distance of 5 cm?