NEET Physics: Questions 429 - 432 of 2099
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Question number: 429
Question number: 430
A river is flowing from east to west at a speed of 5m/min. A man on south bank of river, capable of swimming 10 m/min in still water, wants to swim across the river in shortest time. He should swim due north.
For the shortest time the man needs to swim perpendicular to the bank.
|a.||Ꭺ is true but Ꭱ is false|
|b.||Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ|
|c.||Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ|
|d.||Both Ꭺ and Ꭱ are false|
Question number: 431
A charged ball B hangs from a silk thread S, which makes an angle θ with a large charged conducting sheet P, as shown in the figure. The surface charge density a of the sheet is proportional to