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Electromagnetism Quiz (Hard)

1. What is the formula to calculate the magnetic field strength inside a solenoid?

a) B = μ₀ * N * I b) B = μ₀ * (N * I) / L c) B = μ₀ * (N * I) / (L * A)

2. In a transformer, if the number of turns in the primary coil is greater than the number of turns in the secondary coil, what type of transformer is it?

a) Step-up transformer b) Step-down transformer c) Isolation transformer

3. What are eddy currents, and how can they be minimized in a transformer?

a) Eddy currents are the currents induced in the core of the transformer, and they can be minimized by using a laminated core b) Eddy currents are the currents induced in the windings of the transformer, and they can be minimized by using a ferromagnetic core c) Eddy currents are the currents induced in the primary coil of the transformer, and they can be minimized by using a thicker wire

4. Which law describes the magnetic field produced by a current-carrying conductor?

a) Coulomb's law b) Ampere's law c) Ohm's law

5. What is the SI unit of magnetic flux density (magnetic induction)?

a) Tesla b) Weber c) Henry

6. How is the direction of the magnetic field around a current-carrying conductor determined using the right-hand rule?

a) Point the thumb in the direction of the current, and the fingers will curl in the direction of the magnetic field b) Point the thumb in the direction of the magnetic field, and the fingers will curl in the direction of the current c) Point the index finger in the direction of the current, and the thumb will point in the direction of the magnetic field

7. When a current-carrying conductor is placed in an external magnetic field, what is the direction of the force experienced by the conductor?

a) Perpendicular to both the current and the magnetic field b) Parallel to the current and the magnetic field c) Opposite to the direction of the magnetic field

8. What is the principle behind the working of a magnetic levitation (maglev) train?

a) Electromagnetic induction b) Electromagnetic repulsion and attraction c) Eddy current braking

9. What is the purpose of the iron core in an electromagnet?

a) To increase the resistance and prevent overheating b) To increase the inductance and store more energy c) To enhance the magnetic field strength

10. What are magnetic domains, and how are they related to the magnetic properties of materials?

a) Magnetic domains are microscopic regions within a material where the magnetic moments of atoms are aligned in the same direction, and they determine the magnetic behavior of the material b) Magnetic domains are macroscopic regions where the magnetic field is strongest, and they determine the size of the magnet c) Magnetic domains are regions within a magnet where the magnetic field is zero, and they determine the magnet's stability