A conducting sphere 45 cm in diameter carries an excess of charge, and no other charges are present. You measure the potential of the surface of this sphere and find it to be 14 kV relative to infinity. Find the excess charge on this sphere.

The excess charge is

Explanation:

From the question we are told that

      The diameter is

       The potential of the surface is

The radius of the sphere is  

substituting values

The potential on the surface is mathematically represented as  

Where k is coulomb's constant with value  

  given from the question that there is no other charge the Q is the excess charge  

Thus  

substituting values

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i think the answer is a, hope this is right, that would be my best guess.