Magnetism - Magnetism & Matter

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Q1. 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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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 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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Q4. 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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Q5. What is the formula for the magnetic field at the center of a circular loop of radius r carrying a current I? (2023)

Solution:

The magnetic field (B) at the center of a circular loop is given by B = μ₀I/2r.

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Q6. 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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Q7. What is the principle behind the working of a galvanometer? (2023)

Solution:

A galvanometer works on the principle of the magnetic force acting on a current-carrying conductor placed in a magnetic field.

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Q8. 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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Q9. 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.

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Q10. 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.