A student says, "If a bar magnet is cut transversely, each piece becomes weaker because its pole strength decreases." Which evaluation is correct?
AThe statement is correct because both pole strength and dipole moment decrease
BThe statement is incorrect because pole strength remains the same, though dipole moment decreases
CThe statement is incorrect because both pole strength and dipole moment remain unchanged
DThe statement is correct because only pole strength decreases
Answer & Solution
Correct answer: B. The statement is incorrect because pole strength remains the same, though dipole moment decreases
The claim confuses pole strength with dipole moment. The notes clearly state that for a transverse cut, pole strength is unaffected, but dipole moment becomes half. So the magnet's moment decreases, not its pole strength.
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