An isolated metal sphere is charged using a power supply. Which single quantity can be used to determine the capacitance of the sphere?
The diameter of the sphere.
The charge on the sphere.
The resistance of the metal.
The e.m.f. of the power supply.
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The electric potential at a distance R from the centre of a charge +Q is +40 V.
What is the potential at the point P for the arrangement of the charges +Q and −1.5Q as shown below?
− 20 V
− 60 V
+ 80 V
+ 100 V
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The diagram below shows two oppositely charged spheres.
The magnitude of the charge on each sphere is the same. The point P is on the line joining the centres of the spheres and is the same distance from the centre of each sphere.
Which statement is correct?
A negatively charged particle at P will move to the right.
The direction of the electric field at P is to the left.
The electric potential at P is zero.
The magnitude of the electric field strength at P is zero.
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