Q1. What is the direction of the magnetic field due to a current flowing in a circular loop when viewed from above? (2023)
Solution:
Using the right-hand rule, if the current flows in a counterclockwise direction when viewed from above, the magnetic field direction is out of the plane.
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Q2. Which of the following statements is true regarding the magnetic field due to a solenoid? (2023)
Solution:
A solenoid produces a uniform magnetic field inside and negligible field outside when it is long compared to its diameter.
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Q3. Which of the following statements is true about the magnetic field due to a long straight conductor? (2020)
Solution:
The magnetic field due to a long straight conductor decreases with increasing distance from the conductor.
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Q4. Which of the following statements is true regarding the magnetic field due to a long straight conductor? (2020)
Solution:
The magnetic field around a long straight conductor decreases with distance from the conductor, following the inverse relationship.
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Q5. What happens to the magnetic field when the direction of current in a wire is reversed? (2023)
Solution:
Reversing the direction of current in a wire reverses the direction of the magnetic field around it.
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Q6. What is the magnetic field inside a toroidal solenoid? (2023)
Solution:
The magnetic field inside a toroidal solenoid is uniform and non-zero, and it is given by B = (μ₀NI)/(2πr), where N is the number of turns, I is the current, and r is the distance from the center.
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Q7. What happens to the magnetic field strength inside a solenoid if the current through it is doubled? (2021)
Solution:
The magnetic field strength inside a solenoid is directly proportional to the current flowing through it. Therefore, if the current is doubled, the magnetic field strength also doubles.
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Q8. What is the effect of reversing the direction of current in a loop of wire on the magnetic field? (2019)
Solution:
Reversing the direction of current in a loop of wire reverses the direction of the magnetic field produced by the loop.
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Q9. A circular loop of wire carrying current produces a magnetic field. What is the shape of the magnetic field lines inside the loop? (2020)
Solution:
Inside the loop, the magnetic field lines are nearly uniform and parallel, indicating a strong and consistent magnetic field.
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Q10. A circular loop of wire carrying current produces a magnetic field. What is the shape of the magnetic field lines? (2020)
Solution:
The magnetic field lines around a circular loop of wire are concentric circles centered on the axis of the loop.
