A thin uniform annular disc (see figure) of mass has outer radius and inner radius . The work required to take a unit mass from point on its axis to infinity is

a) |
b) |
c) |
d) |

A thin uniform annular disc (see figure) of mass has outer radius and inner radius . The work required to take a unit mass from point on its axis to infinity is

a) |
b) |
c) |
d) |

1 Answer

127 votes

**(a)**

Potential at point will be obtained by in integration as given below. Let be the mass of small rings as shown

127 votes

127