Magnetic field Mcq questions answer
What is a magnetic field?
a) A region around a magnet where the force of attraction or repulsion is felt
b) A region where electric charges are present
c) A region where there is a strong electric current
d) A region where there is a strong gravitational force
Answer: a) A region around a magnet where the force of attraction or repulsion is felt
What is the SI unit of magnetic field strength?
a) Tesla (T)
b) Newton (N)
c) Ampere (A)
d) Watt (W)
Answer: a) Tesla (T)
Magnetic field lines are:
a) Always parallel to each other
b) Always perpendicular to each other
c) Always circular
d) Never cross each other
Answer: d) Never cross each other
Magnetic field lines emerge from:
a) North pole of a magnet and terminate at the south pole
b) South pole of a magnet and terminate at the north pole
c) Both north and south poles of a magnet
d) Only the south pole of a magnet
Answer: a) North pole of a magnet and terminate at the south pole
The strength of the magnetic field is stronger:
a) Near the north pole of a magnet
b) Near the south pole of a magnet
c) Equally strong near both poles of a magnet
d) It does not depend on the pole of the magnet
Answer: a) Near the north pole of a magnet
The Earth’s magnetic field is primarily generated by:
a) The rotation of the Earth’s core
b) The rotation of the Earth around the Sun
c) Human activities
d) Other celestial bodies
Answer: a ) The rotation of the Earth’s core
Which of the following is not a magnetic material?
a) Iron
b) Copper
c) Nickel
d) Cobalt
Answer: b) Copper
The direction of the magnetic field inside a solenoid is:
a) From south pole to north pole
b) From north pole to south pole
c) Along the axis of the solenoid
d) Perpendicular to the axis of the solenoid
Answer: c) Along the axis of the solenoid
The magnetic field inside a current-carrying wire is:
a) Zero
b) Concentrated around the wire
c) Only present at the ends of the wire
d) Uniform throughout the wire
Answer: b) Concentrated around the wire
The strength of the magnetic field produced by a current-carrying wire depends on:
a) The length of the wire
b) The resistance of the wire
c) The current flowing through the wire
d) The voltage across the wire
Answer: c) The current flowing through the wire
The direction of the magnetic field produced by a current-carrying wire can be determined using:
a) Ampere’s law
b) Faraday’s law
c) Lenz’s law
d) Right-hand rule
Answer: d) Right-hand rule
The strength of the magnetic field produced by a current-carrying wire decreases with:
a) Increasing current
b) Decreasing current
c) Increasing distance from the wire
d) Decreasing distance from the wire
Answer: c) Increasing distance from the wire
The magnetic field produced by a straight current-carrying wire is:
a) Concentric circles around the wire
b) Parallel to the wire
c) Radial outward from the wire
d) Radial inward towards the wire
Answer: a) Concentric circles around the wire
The strength of the magnetic field produced by a current-carrying wire is directly proportional to:
a) The length of the wire
b) The resistance of the wire
c) The square of the current flowing through the wire
d) The voltage across the wire
Answer: c) The square of the current flowing through the wire
The magnetic field inside a current-carrying loop of wire is:
a) Zero
b) Concentrated at the center of the loop
c) Only present along the edges of the loop
d) Uniform throughout the loop
Answer: b) Concentrated at the center of the loop
The strength of the magnetic field produced by a current-carrying loop of wire increases with:
a) Increasing current
b) Decreasing current
c) Increasing radius of the loop
d) Decreasing radius of the loop
Answer: a) Increasing current
The magnetic field produced by a current-carrying loop of wire is:
a) Concentric circles inside the loop
b) Parallel to the loop
c) Radial outward from the loop
d) Radial inward towards the loop
Answer: c) Radial outward from the loop
The strength of the magnetic field produced by a current-carrying loop of wire is maximum at:
a) The center of the loop
b) The edges of the loop
c) The top of the loop
d) The bottom of the loop
Answer: a) The center of the loop
The magnetic field produced by a current-carrying loop of wire can be increased by:
a) Increasing the resistance of the wire
b) Increasing the voltage across the wire
c) Increasing the current flowing through the wire
d) Decreasing the number of turns in the loop
Answer: c) Increasing the current flowing through the wire
The direction of the magnetic field produced by a current-carrying loop of wire can be determined using:
a) Ampere’s law
b) Faraday’s law
c) Lenz’s law
d) Right-hand rule
Answer: d) Right-hand rule
The strength of the magnetic field produced by a current-carrying solenoid depends on:
a) The length of the solenoid
b) The resistance of the solenoid
c) The current flowing through the solenoid
d) The voltage across the solenoid
Answer: c) The current flowing through the solenoid
The magnetic field inside a current-carrying solenoid is:
a) Zero
b) Concentrated at the ends of the solenoid
c) Uniform throughout the solenoid
d) Only present at the center of the solenoid
Answer: c) Uniform throughout the solenoid
The strength of the magnetic field produced by a current-carrying solenoid increases with:
a) Increasing current
b) Decreasing current
c) Increasing number of turns in the solenoid
d) Decreasing number of turns in the solenoid
Answer: c) Increasing number of turns in the solenoid
The direction of the magnetic field inside a current-carrying solenoid is:
a) From south pole to north pole
b) From north pole to south pole
c ) Along the axis of the solenoid
d) Perpendicular to the axis of the solenoid
Answer: c) Along the axis of the solenoid
The strength of the magnetic field produced by a current-carrying solenoid can be increased by:
a) Increasing the resistance of the solenoid
b) Increasing the length of the solenoid
c) Decreasing the current flowing through the solenoid
d) Increasing the number of turns in the solenoid
Answer: d) Increasing the number of turns in the solenoid