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. In which direction does the magnetic field point inside a solenoid carrying current? (2023)
Solution:
Inside a solenoid, the magnetic field lines run from the north pole to the south pole, similar to a bar magnet.
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Q3. Which of the following statements is true about the magnetic field due to a current-carrying loop? (2020)
Solution:
The magnetic field due to a current-carrying loop is strongest at the center of the loop and decreases as you move away from the center.
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Q4. What is the shape of the magnetic field lines around a circular loop of wire carrying current? (2021)
Solution:
The magnetic field lines around a circular loop of wire carrying current are in the shape of concentric circles, with the center of the loop being the point of maximum field strength.
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Q5. Which of the following statements is true about the magnetic field inside a solenoid? (2019)
Solution:
Inside a long solenoid, the magnetic field is uniform and parallel to the axis of the solenoid, provided the solenoid is long enough.
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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 is the direction of the magnetic field produced by a current-carrying wire when viewed from one end? (2023)
Solution:
The direction of the magnetic field produced by a current-carrying wire depends on the direction of the current, as determined by the right-hand rule.
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Q8. Which of the following statements is true regarding the magnetic field inside a long solenoid? (2023)
Solution:
Inside a long solenoid, the magnetic field is uniform and parallel to the axis of the solenoid, provided the solenoid is long enough.
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Q9. What happens to the magnetic field strength inside a solenoid if the current is increased? (2021)
Solution:
The magnetic field strength inside a solenoid is directly proportional to the current flowing through it.
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Q10. What happens to the magnetic field strength inside a long solenoid if the current is doubled? (2021)
Solution:
The magnetic field strength inside a solenoid is directly proportional to the current flowing through it. Therefore, doubling the current will double the magnetic field strength.
