| 1. Magnetic field at any point inside the straight solenoid is given as: |
B = μ0nI
B = μ0+nI
B = μ0/nI
None
|
| 2. Lorentz force is given by the formula: |
F = q(v – B – E)
F = q(v + B + E)
F = q(v * B * E)
F = q(v * B + E)
|
| 3. The magnetic moment of a current I carrying a circular coil of radius r and number of turns N varies as: |
r²
1/r²
r³
None
|
| 4. A 200 turn closely wound circular coil of radius 15 cm carries a current of 4 A. The magnetic moment of this coil is: |
36.5 A m²
56.5 A m²
65.5 A m²
12 A m²
|
| 5. When the charged particles move in a combined magnetic and electric field, the force acting is known as: |
Centripetal force
Centrifugal force
Lorentz force
Orbital force
|
| 6. Magnetic field at the center of a circular current loop of radius R is proportional to: |
1/R
R²
1/R²
R³
|
| 7. The direction of the magnetic field due to a current-carrying conductor can be determined using: |
Fleming's Left-Hand Rule
Right-Hand Thumb Rule
Ampere’s Law
Faraday’s Law
|
| 8. The SI unit of magnetic flux is: |
Tesla
Weber
Ampere
Henry
|
| 9. Faraday’s Law of Electromagnetic Induction states that the induced EMF is proportional to: |
The rate of change of magnetic flux
The magnetic field strength
The electric field strength
The velocity of the charged particle
|
| 10. A moving charge in a magnetic field experiences a force that is: |
Parallel to the magnetic field
Perpendicular to both velocity and magnetic field
Opposite to the direction of motion
Parallel to the velocity of the particle
|
| 11. Which of the following is true for a charged particle moving in a magnetic field? |
The magnetic force does no work on the particle
The particle gains kinetic energy
The magnetic field increases the speed of the particle
The magnetic force accelerates the particle in the direction of the field
|
| 12. The magnetic field outside a long straight current-carrying conductor is: |
Inversely proportional to the distance from the conductor
Directly proportional to the distance from the conductor
Independent of the distance
Proportional to the square of the distance from the conductor
|
| 13. A solenoid is a type of: |
Permanent magnet
Electromagnet
Static charge
Ferromagnetic material
|
| 14. When a current-carrying conductor is placed in a magnetic field, the force on the conductor is maximum when the angle between the current and the magnetic field is: |
90 degrees
0 degrees
45 degrees
180 degrees
|
| 15. The magnetic flux through a surface is zero when the magnetic field is: |
Parallel to the surface
Perpendicular to the surface
At an angle of 45 degrees to the surface
None of the above
|
| 16. Which law states that the induced current will oppose the change in magnetic flux that produced it? |
Lenz’s Law
Faraday’s Law
Ampere’s Law
Coulomb’s Law
|
| 17. The magnetic field inside a long straight solenoid carrying current is: |
Zero
Uniform
Increasing towards the center
Decreasing towards the center
|
| 18. The force per unit length between two parallel current-carrying conductors is proportional to: |
The product of their velocities
The product of their currents
The square of their currents
The inverse of their currents
|
| 19. The phenomenon in which an induced current is produced due to a changing magnetic field is called: |
Electromagnetic Induction
Magnetic Resonance
Electric Potential
Magnetic Flux
|
| 20. The magnitude of the magnetic force on a charged particle moving through a magnetic field is zero when: |
The particle moves parallel to the magnetic field
The particle moves perpendicular to the magnetic field
The velocity of the particle is very high
The velocity of the particle is very low
|
