Q. What is the direction of the magnetic field inside a bar magnet? (2023)
A.
From south to north
B.
From north to south
C.
Circular
D.
Random
Show solution
Solution
The direction of the magnetic field inside a bar magnet is from the north pole to the south pole.
Correct Answer:
B
— From north to south
Learn More →
Q. What is the effect of increasing the current in a coil on the magnetic field produced? (2022)
A.
Increases the magnetic field
B.
Decreases the magnetic field
C.
No effect
D.
Reverses the magnetic field
Show solution
Solution
Increasing the current in a coil increases the magnetic field produced by the coil.
Correct Answer:
A
— Increases the magnetic field
Learn More →
Q. What is the effect of increasing the current in a solenoid on its magnetic field strength? (2021)
A.
Increases
B.
Decreases
C.
No effect
D.
Reverses direction
Show solution
Solution
Increasing the current in a solenoid increases its magnetic field strength, as the magnetic field is directly proportional to the current.
Correct Answer:
A
— Increases
Learn More →
Q. What is the effect of increasing the number of turns in a coil on the magnetic field strength produced by it? (2022)
A.
Increases the field strength
B.
Decreases the field strength
C.
No effect
D.
Reverses the field direction
Show solution
Solution
Increasing the number of turns in a coil increases the magnetic field strength produced by it, as the field strength is directly proportional to the number of turns.
Correct Answer:
A
— Increases the field strength
Learn More →
Q. What is the effect of temperature on the magnetism of ferromagnetic materials? (2022)
A.
Increases magnetism
B.
Decreases magnetism
C.
No effect
D.
Reverses magnetism
Show solution
Solution
Increasing temperature generally decreases the magnetism of ferromagnetic materials, as thermal agitation disrupts the alignment of magnetic domains.
Correct Answer:
B
— Decreases magnetism
Learn More →
Q. What is the force experienced by a current-carrying conductor of length L in a magnetic field B at an angle θ? (2023)
A.
F = BIL
B.
F = BIL sin(θ)
C.
F = BIL cos(θ)
D.
F = BIL²
Show solution
Solution
The force on a current-carrying conductor in a magnetic field is given by F = BIL sin(θ), where θ is the angle between the conductor and the magnetic field.
Correct Answer:
B
— F = BIL sin(θ)
Learn More →
Q. What is the force on a 2 m long conductor carrying a current of 5 A in a magnetic field of 0.3 T at an angle of 30° to the field? (2021)
A.
0.75 N
B.
1.5 N
C.
2.5 N
D.
3.0 N
Show solution
Solution
Using the formula F = BIL sin(θ), F = 0.3 * 2 * 5 * sin(30°) = 1.5 N.
Correct Answer:
B
— 1.5 N
Learn More →
Q. What is the force on a charge moving in a magnetic field given by F = qvB sin(θ)? (2022)
A.
It is always zero
B.
It depends on the angle θ
C.
It is constant
D.
It is maximum when θ = 90°
Show solution
Solution
The force on a charge moving in a magnetic field is maximum when the angle θ between the velocity vector and the magnetic field is 90°, as sin(90°) = 1.
Correct Answer:
D
— It is maximum when θ = 90°
Learn More →
Q. What is the force on a charge moving in a magnetic field given by the equation F = qvB sin(θ)? (2020)
A.
Charge times velocity
B.
Charge times magnetic field
C.
Charge times velocity times magnetic field times sine of angle
D.
Charge times sine of angle
Show solution
Solution
The force on a charge moving in a magnetic field is given by F = qvB sin(θ), where q is the charge, v is the velocity, B is the magnetic field strength, and θ is the angle between the velocity and the magnetic field.
Correct Answer:
C
— Charge times velocity times magnetic field times sine of angle
Learn More →
Q. What is the magnetic field at a distance r from a long straight wire carrying current I? (2020)
A.
μ₀I/(2πr)
B.
μ₀I/(4πr)
C.
μ₀I/(πr)
D.
μ₀I/(8πr)
Show solution
Solution
The magnetic field around a long straight wire is given by B = (μ₀I)/(2πr).
Correct Answer:
A
— μ₀I/(2πr)
Learn More →
Q. What is the magnetic field at the center of a circular loop carrying current? (2022)
A.
Zero
B.
Directly proportional to current
C.
Inversely proportional to radius
D.
Both A and B
Show solution
Solution
The magnetic field at the center of a circular loop carrying current is directly proportional to the current and inversely proportional to the radius.
Correct Answer:
B
— Directly proportional to current
Learn More →
Q. What is the magnetic field due to a straight current-carrying conductor at a distance 'r' from it? (2020)
A.
μ₀I/2πr
B.
μ₀I/4πr²
C.
μ₀I/2r
D.
μ₀I/πr
Show solution
Solution
The magnetic field due to a straight current-carrying conductor is given by B = μ₀I/2πr.
Correct Answer:
A
— μ₀I/2πr
Learn More →
Q. What is the magnetic field inside a long solenoid when it carries a current? (2023)
A.
Zero
B.
Uniform and directed along the axis
C.
Varies with distance
D.
Depends on the temperature
Show solution
Solution
The magnetic field inside a long solenoid is uniform and directed along the axis of the solenoid when it carries a current.
Correct Answer:
B
— Uniform and directed along the axis
Learn More →
Q. What is the magnetic field inside a long solenoid when the current is flowing through it? (2023)
A.
Zero
B.
Uniform and parallel
C.
Concentric circles
D.
Radial
Show solution
Solution
The magnetic field inside a long solenoid is uniform and parallel to the axis of the solenoid.
Correct Answer:
B
— Uniform and parallel
Learn More →
Q. What is the magnetic field inside a long solenoid when the current is steady? (2023)
A.
Zero
B.
Uniform and parallel to the axis
C.
Varies with distance
D.
Depends on the temperature
Show solution
Solution
The magnetic field inside a long solenoid is uniform and parallel to the axis of the solenoid when the current is steady.
Correct Answer:
B
— Uniform and parallel to the axis
Learn More →
Q. What is the magnetic field inside a long solenoid? (2023)
A.
Zero
B.
Uniform and parallel
C.
Concentric circles
D.
Decreasing
Show solution
Solution
The magnetic field inside a long solenoid is uniform and parallel to the axis of the solenoid.
Correct Answer:
B
— Uniform and parallel
Learn More →
Q. Which law relates the magnetic field around a conductor to the current flowing through it? (2023)
A.
Faraday's Law
B.
Ampere's Law
C.
Ohm's Law
D.
Lenz's Law
Show solution
Solution
Ampere's Law relates the magnetic field around a conductor to the current flowing through it.
Correct Answer:
B
— Ampere's Law
Learn More →
Q. Which of the following materials is a ferromagnet? (2023)
A.
Copper
B.
Aluminum
C.
Iron
D.
Gold
Show solution
Solution
Iron is a ferromagnetic material, which means it can be magnetized and retains its magnetic properties.
Correct Answer:
C
— Iron
Learn More →
Q. Which of the following materials is a ferromagnetic material? (2020)
A.
Copper
B.
Aluminum
C.
Iron
D.
Gold
Show solution
Solution
Iron is a ferromagnetic material, which means it can be magnetized and has a high magnetic permeability.
Correct Answer:
C
— Iron
Learn More →
Q. Which of the following materials is considered ferromagnetic? (2022)
A.
Copper
B.
Aluminum
C.
Iron
D.
Gold
Show solution
Solution
Iron is considered a ferromagnetic material, which can be magnetized and retains its magnetism.
Correct Answer:
C
— Iron
Learn More →
Showing 31 to 50 of 50 (2 Pages)
