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A bar magnet of magnetic moment 1.5 J/T lies aligned with the direction of a uniform magnetic field of 0.22 T. What is the amount of work required by an external torque to turn the magnet so as to align its magnetic moment opposite to the field direction?
  • a)
    0.66J
  • b)
    0.76J nC
  • c)
    0.86J
  • d)
    0.56J
Correct answer is option 'A'. Can you explain this answer?
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Verified Answer
A bar magnet of magnetic moment 1.5 J/T lies aligned with the directio...
Magnetic moment, M= 1.5 J T-1
Magnetic field strength, B= 0.22 T
W = - MB (cos θ2 - cos θ1)
  = -1.5 x 0.22 (cos 180° - cos 0°)
  = -0.33 (-1 - 1) 
  = 0.66 J
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Most Upvoted Answer
A bar magnet of magnetic moment 1.5 J/T lies aligned with the directio...
Given data:
- Magnetic moment of the bar magnet, m = 1.5 J/T
- Magnetic field, B = 0.22 T
Formula used:
- The work done in turning the magnet is given by the formula:
\[ W = -\vec{M} \cdot \vec{B} \]
Calculation:
- Given that the magnetic moment of the bar magnet is aligned with the field direction, the angle between the magnetic moment and the field direction is 0 degrees.
- When the magnet is turned to align its magnetic moment opposite to the field direction, the angle between the magnetic moment and the field direction is 180 degrees.
Substitute the values into the formula:
\[ W = -mB\cos\theta \]
\[ W = -1.5 \times 0.22 \times \cos(180) \]
\[ W = -0.33 \times (-1) \]
\[ W = 0.33 J \]
Therefore, the amount of work required by an external torque to turn the magnet so as to align its magnetic moment opposite to the field direction is 0.33 J.
Correct Answer:
- Option (a) 0.66J
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Read the following text and answer the following questions on the basis of the same:If we move into space and study the Earth's invisible magnetic field, it wouldn't really look like a bar magnet at all. Earth's magnetic field gets stretched out into a comet-like shape with a tail of magnetism that stretches millions of miles behind the earth, opposite to the Sun. The Sun has a wind of gas that pushes the earth's field from the left to the right in the picture.The core of the Earth is an electromagnet. Although the crust is solid, the core of the Earth is surrounded by a mixture of molten iron and nickle. The magnetic field of Earth is caused by currents of electricity that flow in the molten core. These currents are hundreds of miles wide and flow at thousands of miles per hour as the Earth rotates. The powerful magnetic field passes out through the core of the Earth, passes through the crust and enters space. This picture shows the solid inner core region ( inner circl e) surrounded by a molten outer core (the area between the two circles). The currents flow in the outer core, travel outwards through the rest of the earth's interior. If the Earth rotated faster, it would have a stronger magnetic field.By the time the field has reached the surface of Earth, it has weakened a lot, but it is still strong enough to keep your compass needles pointed towards one of its poles. All magnets have two poles: a North Pole and a South Pole. The magnetic poles of earth are not fixed on the surface, but wander quite a bit. The pole in the Northern Hemisphere seems to be moving northwards in geographic latitude by about 10 kilometres per year by an average.Earth’s magnetic field has a

A bar magnet of magnetic moment 1.5 J/T lies aligned with the direction of a uniform magnetic field of 0.22 T. What is the amount of work required by an external torque to turn the magnet so as to align its magnetic moment opposite to the field direction?a)0.66Jb)0.76J nCc)0.86Jd)0.56JCorrect answer is option 'A'. Can you explain this answer?
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A bar magnet of magnetic moment 1.5 J/T lies aligned with the direction of a uniform magnetic field of 0.22 T. What is the amount of work required by an external torque to turn the magnet so as to align its magnetic moment opposite to the field direction?a)0.66Jb)0.76J nCc)0.86Jd)0.56JCorrect answer is option 'A'. Can you explain this answer? for Class 12 2024 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about A bar magnet of magnetic moment 1.5 J/T lies aligned with the direction of a uniform magnetic field of 0.22 T. What is the amount of work required by an external torque to turn the magnet so as to align its magnetic moment opposite to the field direction?a)0.66Jb)0.76J nCc)0.86Jd)0.56JCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Class 12 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A bar magnet of magnetic moment 1.5 J/T lies aligned with the direction of a uniform magnetic field of 0.22 T. What is the amount of work required by an external torque to turn the magnet so as to align its magnetic moment opposite to the field direction?a)0.66Jb)0.76J nCc)0.86Jd)0.56JCorrect answer is option 'A'. Can you explain this answer?.
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