Q1. The force on a charged particle moving in a magnetic field is maximum when: (2021)
Solution:
The force on a charged particle moving in a magnetic field is maximum when the particle moves perpendicular to the field.
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Q2. What is the direction of the magnetic field inside a bar magnet? (2023)
Solution:
The direction of the magnetic field inside a bar magnet is from the north pole to the south pole.
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Q3. In a magnetic field, the force on a charged particle is maximum when the angle between the velocity and the magnetic field is: (2019)
Solution:
The force on a charged particle in a magnetic field is maximum when the angle between the velocity and the magnetic field is 90 degrees.
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Q4. What is the direction of the magnetic field around a straight conductor carrying current? (2023)
Solution:
The direction of the magnetic field around a straight conductor carrying current is counterclockwise when viewed from the positive end of the conductor.
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Q5. What is the force experienced by a current-carrying conductor of length L in a magnetic field B at an angle θ? (2023)
Solution:
The force on a current-carrying conductor in a magnetic field is given by F = BIL sin(θ), where θ is the angle between the conductor and the magnetic field.
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Q6. What happens to the magnetic field when the current in a wire is reversed? (2023)
Solution:
When the current in a wire is reversed, the direction of the magnetic field also reverses.
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Q7. What is the effect of increasing the current in a coil on the magnetic field produced? (2022)
Solution:
Increasing the current in a coil increases the magnetic field produced by the coil.
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Q8. What is the effect of temperature on the magnetism of ferromagnetic materials? (2022)
Solution:
Increasing temperature generally decreases the magnetism of ferromagnetic materials, as thermal agitation disrupts the alignment of magnetic domains.
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Q9. What is the magnetic field at a distance r from a long straight wire carrying current I? (2020)
Solution:
The magnetic field around a long straight wire is given by B = (μ₀I)/(2πr).
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Q10. What is the force on a 2 m long conductor carrying a current of 5 A in a magnetic field of 0.3 T at an angle of 30° to the field? (2021)
Solution:
Using the formula F = BIL sin(θ), F = 0.3 * 2 * 5 * sin(30°) = 1.5 N.
