A PC monitor is usually covered in dust because:

The room needs cleaning

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The dust particles are attracted by magnets in the monitor

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The dust particles are attracted by static charges on the monitor

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None of these

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Solution

The correct option is C
The dust particles are attracted by static charges on the monitor

The side of the dust particle towards the screen is negatively charged and the other side is positively charged. Now due to the inverse square law, the force of attraction is more than the repulsion as the negative side is closer and the particle experiences a net force towards the screen.

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