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A bar magnet AB with magnetic moment M is cut into two equal parts perpendicular to its axis. One part is kept over the other so that end B is exactly over A. What will be the magnetic moment of the combination so formed ?
When a bar magnet of magnetic moment M is cut into two equal parts perpendicular to its length, each part gets half the length but retains the same pole strength. Hence, the magnetic moment of each piece becomes M/2. Placing one over the other with opposite poles touching (B over A), their magneticRead more
When a bar magnet of magnetic moment
M is cut into two equal parts perpendicular to its length, each part gets half the length but retains the same pole strength. Hence, the magnetic moment of each piece becomes M/2. Placing one over the other with opposite poles touching (B over A), their magnetic moments oppose and cancel out. Answer: (A) Zero.
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The value of the magnetic susceptibility for a super conductor is :
The magnetic susceptibility (χ) of a superconductor is highly negative, typically χ =−1. This is because superconductors exhibit perfect diamagnetism—they completely expel magnetic fields from their interior (Meissner effect). As a result, they oppose applied magnetic fields strongly, indicating a lRead more
The magnetic susceptibility (χ) of a superconductor is highly negative, typically
χ =−1. This is because superconductors exhibit perfect diamagnetism—they completely expel magnetic fields from their interior (Meissner effect). As a result, they oppose applied magnetic fields strongly, indicating a large negative susceptibility.
Answer: (D) Highly negative.
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A stationary magnet does not interact with :
A stationary magnet produces a magnetic field, which can interact with magnetic materials (like iron), other magnets, and moving charges (via magnetic force). However, it does not interact with a stationary charge, as magnetic fields only exert force on moving charges, not on static ones. Answer: (DRead more
A stationary magnet produces a magnetic field, which can interact with magnetic materials (like iron), other magnets, and moving charges (via magnetic force). However, it does not interact with a stationary charge, as magnetic fields only exert force on moving charges, not on static ones.
Answer: (D) Stationary charge.
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The area of B-H loop for soft iron, as compared to that for steel is :
The area of the B-H loop represents energy loss per cycle. Soft iron has a narrow B-H loop, meaning it loses less energy and is easily magnetized and demagnetized. Steel, being a hard magnetic material, has a wider loop and higher energy loss. Therefore, the B-H loop area for soft iron is less thanRead more
The area of the B-H loop represents energy loss per cycle. Soft iron has a narrow B-H loop, meaning it loses less energy and is easily magnetized and demagnetized. Steel, being a hard magnetic material, has a wider loop and higher energy loss. Therefore, the B-H loop area for soft iron is less than that for steel.
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The permanent magnetic material is characterised by :
A permanent magnetic material retains magnetism for a long time. It is characterized by a broad hysteresis loop, which indicates high retentivity and coercivity—essential properties for maintaining strong magnetization. Such materials are hard to demagnetize, making them ideal for permanent magnets.Read more
A permanent magnetic material retains magnetism for a long time. It is characterized by a broad hysteresis loop, which indicates high retentivity and coercivity—essential properties for maintaining strong magnetization. Such materials are hard to demagnetize, making them ideal for permanent magnets.
Answer: (B) Broad hysteresis loop.
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