Q1. The magnetic field lines around a straight current-carrying conductor are in which shape? (2022)
Solution:
The magnetic field lines around a straight current-carrying conductor form concentric circles centered around the wire.
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Q2. What is the magnetic moment of a circular loop of radius r carrying a current I? (2021)
Solution:
The magnetic moment (μ) of a circular loop is given by μ = I × A, where A is the area of the loop. For a circular loop, A = πr², thus μ = I × πr² = πr²I.
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Q3. 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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Q4. What is the effect of placing a ferromagnetic material inside a solenoid? (2023)
Solution:
Placing a ferromagnetic material inside a solenoid increases the magnetic field due to the material's high magnetic permeability.
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Q5. The magnetic field inside a long solenoid is given by which of the following expressions? (2020)
Solution:
The magnetic field (B) inside a long solenoid is given by B = μ₀nI, where n is the number of turns per unit length and I is the current.
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Q6. What is the relationship between magnetic field strength and distance from a long straight conductor? (2023)
Solution:
The magnetic field strength around a long straight conductor decreases with distance from the conductor, following the inverse relationship.
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Q7. 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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Q8. 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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Q9. The force on a charged particle moving in a magnetic field is maximum when the angle between the velocity and magnetic field is: (2021)
Solution:
The force on a charged particle in a magnetic field is given by F = qvB sin(θ). The force is maximum when sin(θ) = 1, which occurs at θ = 90 degrees.
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Q10. What happens to the magnetic field inside a solenoid when the current is increased? (2020)
Solution:
The magnetic field inside a solenoid is directly proportional to the current. Therefore, if the current is increased, the magnetic field also increases.
