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5 marksElectric Fields

CAPE Physics Unit 2 · 2003 · Paper 2 · Question 4(c)(i)

Charged water drops and potential.

A spherical drop of water carrying a charge of 30 x 10^-12 C has a potential of 500 V at its surface. Calculate the radius of the drop.

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Other parts of this question

  1. 4(a)State Coulomb's law for electrostatic charges and define 'electric field'.[2 marks]
  2. 4(b)(i)a)Explain why the pollen grain 'jumps' to the bee.[2 marks]
  3. 4(b)(i)b)Explain why the pollen grain clings to the bee during the flight.[1 mark]
  4. 4(b)(i)c)Explain why the pollen grain 'jumps' away from the bee to the stigma.[2 marks]
  5. 4(b)(ii)a)Assuming that a bee with a charge of 45.0 x 10^-12 C is a spherical conductor, calculate the magnitude of the bee's electric field at the location of a pollen…[2 marks]
  6. 4(b)(ii)b)State whether this field is uniform or non-uniform.[1 mark]
  7. 4(c)(ii)Two such drops of the same charge and radius combine to form a single spherical drop. Calculate the potential at the surface of the new drop.[5 marks]

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