Q1. The force on a charged particle moving in a magnetic field is given by which law? (2021)
Solution:
The force (F) on a charged particle moving in a magnetic field is described by the Lorentz Force Law, F = q(v × B), where q is the charge, v is the velocity, and B is the magnetic field.
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Q2. Which of the following materials is considered a ferromagnetic material? (2021)
Solution:
Iron is a ferromagnetic material, which means it can be magnetized and retains its magnetic properties.
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Q3. What is the direction of the magnetic field inside a current-carrying circular loop? (2019)
Solution:
Using the right-hand rule, if the current flows in a counterclockwise direction, the magnetic field inside the loop points out of the plane.
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Q4. A magnetic dipole moment is defined as the product of which two quantities? (2022)
Solution:
The magnetic dipole moment (μ) is defined as the product of the current (I) flowing through a loop and the area (A) of the loop, μ = I × A.
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Q5. The magnetic field due to a straight current-carrying conductor at a distance r is given by which formula? (2022)
Solution:
The magnetic field (B) at a distance r from a straight current-carrying conductor is given by B = μ₀I/2πr.
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Q6. What is the effect of placing a ferromagnetic material in a magnetic field? (2023)
Solution:
When a ferromagnetic material is placed in a magnetic field, it becomes magnetized and can retain its magnetism even after the external field is removed.
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Q7. What is the SI unit of magnetic field strength? (2023)
Solution:
The SI unit of magnetic field strength is the Tesla (T).
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Q8. What is the SI unit of magnetic moment? (2023)
Solution:
The SI unit of magnetic moment is Joule per Tesla (J/T), which can also be expressed as Ampere-meter squared (A·m²).
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Q9. A magnetic field is produced by which of the following? (2021)
Solution:
A magnetic field is produced by moving electric charges, such as those in a current-carrying wire.
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Q10. The magnetic field due to a straight current-carrying conductor decreases with distance from the wire. What is the relationship? (2019)
Solution:
The magnetic field (B) around a straight current-carrying conductor is inversely proportional to the distance (r) from the wire, given by B ∝ 1/r.
