Problem Set No.: 3 Electrostatics 1 A plastic rod is rubbed with a cloth and becomes positively charged. After charging, the rod is held close to the suspended table-tennis ball shown in Fig. 1.1. The table-tennis ball is covered with metal paint and is initially uncharged. light table-tennis ball covered with metal paint nylon thread positively charged rod Fig. 1.1 (a) Describe what happens to the charges on the metal-painted table-tennis ball as the positively- charged rod is brought close to the ball. (b) The ball is attracted towards the charged rod. Explain why this happens. (c) When it is a few centimetres away from the rod, the ball is briefly touched by a wire connected to earth. In terms of the movement of charges, describe what happens to the charge on the ball. [1] [2] [2]

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Problem Set No.: 3
Electrostatics
1 A plastic rod is rubbed with a cloth and becomes positively charged. After charging, the rod is held
close to the suspended table-tennis ball shown in Fig. 1.1. The table-tennis ball is covered with metal
paint and is initially uncharged.
light
table-tennis ball
covered with metal
paint
nylon thread
positively
charged rod
Fig. 1.1
(a) Describe what happens to the charges on the metal-painted table-tennis ball as the positively-
charged rod is brought close to the ball.
(b) The ball is attracted towards the charged rod. Explain why this happens.
(c) When it is a few centimetres away from the rod, the ball is briefly touched by a wire connected
to earth. In terms of the movement of charges, describe what happens to the charge on the ball.
[1]
[2]
[2]
Transcribed Image Text:Problem Set No.: 3 Electrostatics 1 A plastic rod is rubbed with a cloth and becomes positively charged. After charging, the rod is held close to the suspended table-tennis ball shown in Fig. 1.1. The table-tennis ball is covered with metal paint and is initially uncharged. light table-tennis ball covered with metal paint nylon thread positively charged rod Fig. 1.1 (a) Describe what happens to the charges on the metal-painted table-tennis ball as the positively- charged rod is brought close to the ball. (b) The ball is attracted towards the charged rod. Explain why this happens. (c) When it is a few centimetres away from the rod, the ball is briefly touched by a wire connected to earth. In terms of the movement of charges, describe what happens to the charge on the ball. [1] [2] [2]
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