Characteristics of Lines of Magnetic Flux mcq
The lines of magnetic flux around a straight current-carrying wire are:
a) Straight lines
b) Circular loops
c) S-shaped curves
d) Hyperbolic curves
Answer: b) Circular loops
The lines of magnetic flux inside a bar magnet:
a) Start from the north pole and end at the south pole
b) Start from the south pole and end at the north pole
c) Form straight lines from one pole to the other
d) Are parallel to the surface of the magnet
Answer: a) Start from the north pole and end at the south pole
The density of magnetic field lines indicates:
a) The strength of the magnetic field
b) The direction of the magnetic field
c) The resistance of the magnetic material
d) The size of the magnet
Answer: a) The strength of the magnetic field
The magnetic field lines outside a magnet:
a) Are always perpendicular to the surface of the magnet
b) Curve outward from the north pole and inward toward the south pole
c) Form closed loops within the magnet
d) Are straight lines that extend infinitely
Answer: b) Curve outward from the north pole and inward toward the south pole
The number of magnetic field lines passing through a given area represents the:
a) Magnetic permeability of the material
b) Magnetic resistance of the material
c) Magnetic field strength
d) Magnetic potential energy
Answer: c) Magnetic field strength
The magnetic field lines around a current-carrying loop of wire:
a) Extend infinitely
b) Form concentric circles around the loop
c) Curve inward toward the loop
d) Do not exist
Answer: b) Form concentric circles around the loop
The magnetic field lines inside a solenoid carrying a current are:
a) Parallel to the axis of the solenoid
b) Circular loops
c) Hyperbolic curves
d) Straight lines perpendicular to the axis of the solenoid
Answer: d) Straight lines perpendicular to the axis of the solenoid
The magnetic field lines inside a bar magnet are:
a) Parallel to the surface of the magnet
b) Circular loops
c) Hyperbolic curves
d) Straight lines from one pole to the other
Answer: a) Parallel to the surface of the magnet
The magnetic field lines around a current-carrying coil of wire are similar to those of:
a) A bar magnet
b) A solenoid
c) A straight wire
d) A capacitor
Answer: b) A solenoid
The total magnetic flux passing through a closed surface is:
a) Zero
b) Positive
c) Negative
d) Dependent on the size of the surface
Answer: a) Zero
The unit of magnetic flux is:
a) Tesla
b) Gauss
c) Weber
d) Ampere
Answer: c) Weber
If the magnetic flux through a loop of wire is changing at a rate of 2 Weber per second and the induced EMF in the loop is 4 volts, the number of turns in the loop is:
a) 2
b) 4
c) 6
d) 8
Answer: b) 4
If the magnetic flux through a coil is 3 Weber and the number of turns in the coil is 5, the induced EMF in the coil is 6 volts. What is the rate of change of magnetic flux?
a) 0.5 Weber/s
b) 1 Weber/s
c) 2 Weber/s
d) 3 Weber/s
Answer: c) 2 Weber/s
If the magnetic flux through a coil is 4 Weber and the number of turns in the coil is 10, the induced EMF in the coil is 8 volts. What is the rate of change of magnetic flux?
a) 0.2 Weber/s
b) 0.4 Weber/s
c) 0.6 Weber/s
d) 0.8 Weber/s
Answer: d) 0.8 Weber/s
The magnetic flux through a surface of area 0.5 m² is 2 Weber. What is the magnetic field strength?
a) 1 Weber/m²
b) 2 Weber/m²
c) 3 Weber/m²
d) 4 Weber/m²
Answer: b) 2 Weber/m²
The magnetic flux through a surface is given by 6 Weber, and the area of the surface is 2 m². What is the magnetic field strength?
a) 3 Weber/m²
b) 4 Weber/m²
c) 5 Weber/m²
d) 6 Weber/m²
Answer: a) 3 Weber/m²
The magnetic flux through a coil is changing at a rate of 0.5 Weber/s. If the number of turns in the coil is 8, what is the induced EMF in the coil?
a) 0.25 volts
b) 0.5 volts
c) 1 volt
d) 2 volts
Answer: c) 1 volt
The magnetic flux through a coil is changing at a rate of 2 Weber/s. If the number of turns in the coil is 6, what is the induced EMF in the coil?
a) 0.5 volts
b) 1 volt
c) 2 volts
d) 3 volts
Answer: c) 2 volts
The magnetic flux through a surface is 4 Weber, and the magnetic field strength is 2 Weber/m². What is the area of the surface?
a) 2 m²
b) 3 m²
c) 4 m²
d) 5 m²
Answer: c) 4 m²
The magnetic flux through a surface is 10 Weber, and the magnetic field strength is 2 Weber/m². What is the area of the surface?
a) 4 m²
b) 5 m²
c) 6 m²
d) 8 m²
Answer: b) 5 m²