Q1. 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.
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Q2. What is the magnetic field strength at a distance 'r' from a long straight conductor carrying current 'I'? (2020)
Solution:
The magnetic field strength (B) at a distance 'r' from a long straight conductor is given by the formula B = μ₀I/2πr.
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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 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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Q5. 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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Q6. Which of the following devices uses the principle of electromagnetism? (2019)
Solution:
An electric motor operates on the principle of electromagnetism, converting electrical energy into mechanical energy.
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Q7. 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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Q8. Which of the following devices uses the magnetic effects of current? (2023)
Solution:
An electric motor operates based on the magnetic effects of current, converting electrical energy into mechanical energy.
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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 is the effect of reversing the direction of current in a loop of wire on the magnetic field it produces? (2019)
Solution:
Reversing the direction of current in a loop of wire reverses the direction of the magnetic field produced by that loop.
