Question 10

10.1 A small, metal sphere A carrying a charge of +2 x 10^-9 C is placed on an
insulated stand.

10.1.1 How does the number of electrons compare with the number of
protons in sphere A?

Choose from LESS THAN, GREATER THAN or EQUAL TO. (1)

10¹³ electrons are now added to sphere A

10.1.2 Calculate the new charge on sphere A. (4)

10.2 Two identical metal spheres B and C placed on insulated stands, carry
charges +4 x 10^-6 C and -6 x 10^-6 C respectively as shown in the diagram
below.

The spheres are allowed to touch each other.

After touching the spheres are then separated and brought back to their
original positions as shown in the diagram below.

10.2.1 State the principle of conservation of charge. (2)

10.2.2 Calculate the number of electrons transferred between the two
spheres during contact (6)

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