Question 9

9.1 Two identical metal spheres, P and Q, separated by a distance d, are
suspended from an insulated rigid wooden bar, as shown in the diagram
below. The charge on the spheres are –4 μC and +8 μC respectively.

9.1.1 Sphere Q experiences an electrostatic force.

In which direction will sphere Q move? Write down only TO THE
LEFT or TO THE RIGHT. (1)

The spheres are now made to touch and are then separated.

9.1.2 Were electrons REMOVED FROM or TRANSFERRED TO P?
Give a reason for the answer. (2)

9.1.3 Calculate the distance d between the two spheres if the magnitude
of the force experienced by P is 0,8 N. (3)

9.2 Charges of +4 μC and –3 μC are placed a distance 0,2 m apart on a
straight line, as shown below. Point P is located 0,1 m to the right of the
–3 μC charge.

Calculate the:

9.2.1 Net electric field at point P (5)

9.2.2 Mass of a +6 μC charge placed at P that will experience an
acceleration of magnitude 5 x 102 m∙s^-2 (3)

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