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A thin metallic spherical shell contains...

A thin metallic spherical shell contains a charge Q on it. A point charge q is placed at the center of the shell and another charge `q_1` is placed outside it as shown in the figure. All the three charges are positive. Find the force on the charge

a. at centre due to all charges.
b. at center due to shell.

Text Solution

Verified by Experts

a. No force will be experience by the charge at the
centre as it is electrostatically shielded.

b. There will not be any field at centre due to the charges Q and q. The charge induced at the surface of spherical shell due to q will produce the field towards right. This field will be responsible for producing force at centre towards right.
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Knowledge Check

  • A thin metallic spherical shell contains a charge Q on it. A point charge q is placed at the centre of the shell and another charge q_(1) is placed outside it as shown in figure. All the three charges are positive The force on the charge at the centre is

    A
    towards left
    B
    towards right
    C
    upward
    D
    zero

  • A thin. Metallic spherical shell contains s charge Q on it. A point charge q is placed at the centre of the shell and another charge q_1 is placed outside it as shown in figure (30-Q1). All the three charges are positive. The force on the charge at the centre is

    A
    towards left
    B
    towards right
    C
    upward
    D
    zero.

  • A charge Q_(0) is placed at the center of spherical cavity of a conductor and another charge Q is placed outside the conductor as shown in the figure. The correct statement is :

    A
    Force on `Q_(0)` and Q are equal and opposite
    B
    Force on `Q_(0)` is zero and force on Q is nonzero
    C
    Force on Q and `Q_(0)` is zero
    D
    Force on `Q_(0)` is nonzero and force on Q is zero
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