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A bar magnet of length 14 cm is placed in the magnetic meridian with its north pole pointing towards the geographic north pole. A neutral point is obtained at a distance of 18 cm from the centre of the magnet. If BH = 0.4G, the magnetic moment of the magnet is (1 G = 10-4 T)
  • a)
    2.880 × 103 J T-1
  • b)
    2.880 × 102 J T-1
  • c)
    2.880 J T-1
  • d)
    28.80 J T-1
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
A bar magnet of length 14 cm is placed in the magnetic meridian with i...
To find the magnetic moment of the magnet, we can use the formula:

magnetic moment = BH * distance^3 / 2

Given BH = 0.4 G and distance = 18 cm = 0.18 m, we can substitute these values into the formula:

magnetic moment = 0.4 * 0.18^3 / 2
= 0.4 * 0.18 * 0.18 * 0.18 / 2
= 0.00184992 Tm^3

Since 1 G = 10^-4 T, we can convert the magnetic moment to G by dividing by 10^-4:

magnetic moment = 0.00184992 / 10^-4
= 18.4992 G

Rounded to three decimal places, the magnetic moment of the magnet is approximately 18.499 G.
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Community Answer
A bar magnet of length 14 cm is placed in the magnetic meridian with i...

i.e. 
= = 0.4 × 10-4
⇒ 
= 0.4 × 10-4

M = m × 14 cm = m × 14/100

= 4 × 10-4 × 7203.82 = 2.88 J/T
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A bar magnet of length 14 cm is placed in the magnetic meridian with its north pole pointing towards the geographic north pole. A neutral point is obtained at a distance of 18 cm from the centre of the magnet. If BH = 0.4G, the magnetic moment of the magnet is (1 G = 10-4 T)a)2.880 × 103J T-1b)2.880 × 102J T-1c)2.880 J T-1d)28.80 J T-1Correct answer is option 'C'. Can you explain this answer?
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A bar magnet of length 14 cm is placed in the magnetic meridian with its north pole pointing towards the geographic north pole. A neutral point is obtained at a distance of 18 cm from the centre of the magnet. If BH = 0.4G, the magnetic moment of the magnet is (1 G = 10-4 T)a)2.880 × 103J T-1b)2.880 × 102J T-1c)2.880 J T-1d)28.80 J T-1Correct answer is option 'C'. Can you explain this answer? for JEE 2024 is part of JEE preparation. The Question and answers have been prepared according to the JEE exam syllabus. Information about A bar magnet of length 14 cm is placed in the magnetic meridian with its north pole pointing towards the geographic north pole. A neutral point is obtained at a distance of 18 cm from the centre of the magnet. If BH = 0.4G, the magnetic moment of the magnet is (1 G = 10-4 T)a)2.880 × 103J T-1b)2.880 × 102J T-1c)2.880 J T-1d)28.80 J T-1Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for JEE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A bar magnet of length 14 cm is placed in the magnetic meridian with its north pole pointing towards the geographic north pole. A neutral point is obtained at a distance of 18 cm from the centre of the magnet. If BH = 0.4G, the magnetic moment of the magnet is (1 G = 10-4 T)a)2.880 × 103J T-1b)2.880 × 102J T-1c)2.880 J T-1d)28.80 J T-1Correct answer is option 'C'. Can you explain this answer?.
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