Magnetic Effects of Current and Magnetism (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 110 - 112 of 155
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Question number: 110
» Magnetic Effects of Current and Magnetism » Bar Magnet
Question
A small magnet of magnetic moment 4A-m 2 is placed on a deflection magnetometer in tan-B position at a distance of 20 cm from the compass needle. At what distance from compass needle should another small magnet of moment 0.5 A-m 2 be placed such that the deflection of the needle remains zero?
Choices
| Choice (4) | Response | |
|---|---|---|
| a. | 12 cm |
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| b. | 30 cm |
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| c. | 10 cm |
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| d. | 20 cm |
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Question number: 111
» Magnetic Effects of Current and Magnetism » Para, Dia and Ferro-Magnetic Substances
Assertion (Ꭺ)
The ferromagnetic substance does not obey Curie’s law.
Reason (Ꭱ)
At Curie point a ferromagnetic substance starts behaving as a paramagnetic substance.
Choices
| Choice (4) | Response | |
|---|---|---|
| a. | Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ |
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| b. | Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ |
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| c. | Ꭺ is true but Ꭱ is false |
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| d. | Ꭺ is false but Ꭱ is true |
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Question number: 112
» Magnetic Effects of Current and Magnetism » Bar Magnet
Question
Two magnets A and B are identical and these are arranged as shown in the figure. Their length is negligible in comparison to the separation between them. A magnetic needle is placed between the magnets at point P which gets deflected through an angle 0 under the influence of magnets. The ratio of distances d 1 and d 2 will be
Arrangement of Two Identical Magnets a and B.
Two magnets A and B are identical and these are arranged as shown in the figure. Their length is negligible in comparison to the separation between them. A magnetic needle is placed between the magnets at point P.
Choices
| Choice (4) | Response | |
|---|---|---|
| a. | (2 cot θ) -1/3 |
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| b. | (2 tan θ) 1/3 |
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| c. | (2 cot θ) 1/3 |
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| d. | (2 tan θ) -1/3 |
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