Question:
A bar magnet falls from a height through a metal pipe. Its acceleration will be (\(g\) = acceleration due to gravity)
A bar magnet falls from a height through a metal pipe. Its acceleration will be (\(g\) = acceleration due to gravity)
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Eddy currents in the pipe oppose the motion of the magnet.
Updated On: Nov 12, 2026
- less than \(g\)
- greater than \(g\)
- equal to \(g\)
- zero
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The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept
A falling magnet changes the flux through the pipe wall and induces eddy currents.
Step 2: Lenz's law
The eddy currents create a magnetic field that opposes the motion of the magnet, giving an upward retarding force.
Step 3: Conclusion
The net downward force is reduced, so the acceleration is less than g.
Final Answer:
The magnet falls with an acceleration less than g. \[ \boxed{\text{(A) }\text{less than } g} \]
A falling magnet changes the flux through the pipe wall and induces eddy currents.
Step 2: Lenz's law
The eddy currents create a magnetic field that opposes the motion of the magnet, giving an upward retarding force.
Step 3: Conclusion
The net downward force is reduced, so the acceleration is less than g.
Final Answer:
The magnet falls with an acceleration less than g. \[ \boxed{\text{(A) }\text{less than } g} \]
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