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Questions on topic Magnetism from Class 12 Physics

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Q1. What is the SI unit of magnetic flux?
Weber
Tesla
Henry
Coulomb
Q2. Which law states that the induced electromotive force in a closed circuit is proportional to the rate of change of magnetic flux through the circuit?
Faraday's Law
Ampere's Law
Lenz's Law
Gauss's Law
Q3. What is the direction of the magnetic field lines around a straight conductor carrying current?
From North to South
From South to North
Clockwise
Anticlockwise
Q4. What type of materials are classified as ferromagnetic?
Copper and Aluminum
Iron and Nickel
Gold and Silver
Lead and Zinc
Q5. Which of the following statements is true about magnetic field lines?
They can cross each other
They are always closed loops
They can start from magnetic monopoles
They are denser at the poles
Q6. What happens to the magnetic field inside a solenoid when the current flowing through it is increased?
It decreases
It remains constant
It increases
It becomes zero
Q7. Which of the following devices operates on the principle of electromagnetism?
Electric fan
Transformer
Batteries
Resistors
Q8. What is the formula for the magnetic force experienced by a charged particle moving in a magnetic field?
F = qE
F = qvB sinθ
F = mv^2/r
F = ma
Q9. In which direction does the magnetic force act on a positive charge moving in a magnetic field?
Parallel to the velocity
Opposite to the velocity
Perpendicular to both velocity and magnetic field
Along the magnetic field
Q10. What is the primary cause of Earth's magnetic field?
Solar wind
Movement of molten iron in the outer core
Tectonic plate movement
Magnetic minerals in the crust