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Question

Three rings P, Q and R are dropped at the same time over identiful hollow magnets as shown below. Which of the following describes the order in which the ring P, Q and R reach the bottom of the magnet?
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A
They arrive in the order P, Q, R
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B
They arrive in the order P, R, Q
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C
Rings P and R arrive simultaneously, followed by Q
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D
Rings Q and R arrive simultaneously, followed by P
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Solution

The correct option is D Rings P and R arrive simultaneously, followed by Q
Plastic is non magnetic substance and open ring does not form magnetic poles so due to induction only ring Q will experience retarding force by forming magnetic poles.


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