Forces between charged and uncharged objects
2 marks · EasyA neutral metal sphere is suspended by a thread. A negatively charged rod is brought close to, but not touching, the sphere.
Describe what happens to the sphere as the rod is moved closer.
Explain, in terms of charges, why this occurs.
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Show answer
(a) The sphere is attracted to the rod.
(b) —
Show mark scheme and worked solution
Marking points
B1 (a) · 1 mark · States the sphere is attracted to the rod
M1 (b) · 1 mark · Mentions negative charge repels electrons in the sphere or induces positive charge on the near side, causing attraction
Worked solution
a) The sphere is attracted to the rod.
b) The negative charges in the rod repel the electrons in the sphere, making the near side positive and resulting in attraction.