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A bar magnet of the magnetic moment 5 Am2 has poles 20 cm apart. Calculate the pole strength.
  • a)
    25 Am
  • b)
    4 Am
  • c)
    100 Am
  • d)
    250 Am
Correct answer is option 'A'. Can you explain this answer?
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Most Upvoted Answer
A bar magnet of the magnetic moment 5 Am2 has poles 20 cm apart. Calcu...
Magnetic dipole moment = Pole strength × Magnetic length.
Pole strength = Magnetic dipole moment / Magnetic length
Pole strength = 50.2
Pole strength = 25 Am.
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Community Answer
A bar magnet of the magnetic moment 5 Am2 has poles 20 cm apart. Calcu...
To calculate the pole strength of a bar magnet, we can use the formula:

Magnetic Moment (M) = Pole Strength (m) x Distance between Poles (d)

Given:
Magnetic Moment (M) = 5 Am^2
Distance between Poles (d) = 20 cm = 0.2 m

We need to find the pole strength (m).

Let's substitute the given values into the formula and solve for m:

5 Am^2 = m x 0.2 m

Simplifying the equation:

m = 5 Am^2 / 0.2 m
m = 25 A

Therefore, the pole strength of the bar magnet is 25 A.

Explanation:
- The magnetic moment of a magnet is a measure of its strength. It is given in the unit of Ampere-meter squared (Am^2).
- The pole strength of a magnet refers to the strength of each pole of the magnet.
- The distance between the poles is the distance between the north and south poles of the magnet.
- In this case, we are given the magnetic moment of the bar magnet (5 Am^2) and the distance between its poles (20 cm = 0.2 m).
- By rearranging the formula M = m x d, we can solve for the pole strength (m).
- Substituting the given values into the formula, we find that the pole strength is 25 A.
- The correct answer is option 'A', which corresponds to a pole strength of 25 A.
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A bar magnet of the magnetic moment 5 Am2 has poles 20 cm apart. Calculate the pole strength.a)25 Amb)4 Amc)100 Amd)250 AmCorrect answer is option 'A'. Can you explain this answer?
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