# Magnetomotive Force (MMF) and Magnetic Field Strength mcq

## Magnetomotive Force (MMF) and Magnetic Field Strength mcq

Magnetomotive force (MMF) is a measure of:
a) How easily a material can conduct electricity
b) How well a material can store energy
c) How resistant a material is to magnetic fields
d) The force that produces magnetic flux
Answer: d) The force that produces magnetic flux

The SI unit of magnetomotive force (MMF) is:
a) Ampere
b) Henry
c) Weber
d) Tesla

Magnetomotive force (MMF) is analogous to:
a) Voltage in an electric circuit
b) Current in an electric circuit
c) Resistance in an electric circuit
d) Capacitance in an electric circuit
Answer: a) Voltage in an electric circuit

The symbol used to represent magnetomotive force (MMF) is:
a) M
b) B
c) H
d) Φ

The formula for calculating magnetomotive force (MMF) is:
a) MMF = B/μ
b) MMF = B × μ
c) MMF = H/μ
d) MMF = H × μ

Magnetomotive force (MMF) is determined by:
a) The length of the magnetic circuit
b) The number of turns in the coil
c) The magnetic material used in the circuit
d) All of the above
Answer: d) All of the above

The magnetomotive force (MMF) in a magnetic circuit is the product of:
a) Magnetic field strength and magnetic flux
b) Magnetic field strength and permeability
c) Magnetic flux and permeability
d) Magnetic field strength and magnetic susceptibility
Answer: b) Magnetic field strength and permeability

In a magnetic circuit, magnetomotive force (MMF) is analogous to:
a) Voltage drop
b) Electric current
c) Magnetic field strength
d) Magnetic flux

The total magnetomotive force (MMF) in a magnetic circuit is determined by the sum of the MMFs of:
a) Each magnetic material in the circuit
b) Each turn in the coil
c) Each magnetic field line in the circuit
d) Each magnetic pole in the circuit
Answer: b) Each turn in the coil

The concept of magnetomotive force (MMF) is commonly used in the design and analysis of:
a) Transformers
b) Magnetic circuits
c) Inductors
d) All of the above
Answer: d) All of the above

Magnetic field strength is defined as:
a) The force experienced by a magnetic material in a magnetic field
b) The magnetic flux per unit area
c) The magnetic field produced by a current-carrying conductor
d) The magnetomotive force per unit length
Answer: d) The magnetomotive force per unit length

The SI unit of magnetic field strength is:
a) Tesla
b) Weber
c) Ampere
d) Henry

Magnetic field strength is denoted by the symbol:
a) B
b) M
c) H
d) Φ

The formula for calculating magnetic field strength is:
a) H = B/μ
b) H = B × μ
c) H = MMF/μ
d) H = MMF × μ

Magnetic field strength is determined by:
a) The magnetic material in the circuit
b) The current flowing through a conductor
c) The distance from the magnetic source
d) All of the above
Answer: b) The current flowing through a conductor

Magnetic field strength is directly proportional to:
a) Magnetic flux
b) Permeability
c) Magnetomotive force (MMF)
d) Magnetic susceptibility

The magnetic field strength inside a current-carrying solenoid is:
a) Uniform
b) Varies with distance from the solenoid
c) Zero
d) Cannot be determined

Magnetic field strength is used to quantify:
a) The amount of magnetic flux passing through a surface
b) The magnetic properties of a material
c) The strength of a magnetic field
d) The induced voltage in a circuit
Answer: c) The strength of a magnetic field

Magnetic field strength is independent of:
a) The length of the magnetic circuit
b) The number of turns in a coil
c) The magnetic material used in the circuit
d) The cross-sectional area of the magnetic circuit
Answer: a) The length of the magnetic circuit

The magnetizing force required to establish a certain magnetic field strength in a magnetic material depends on its:
a) Permeability
b) Resistivity
c) Capacitance
d) Inductance

The magnetic field strength at a point near a current-carrying wire is:
a) Directly proportional to the current in the wire
b) Inversely proportional to the distance from the wire
c) Proportional to the square of the distance from the wire
d) Independent of the current and distance
Answer: a) Directly proportional to the current in the wire

The magnetic field strength at the center of a circular loop carrying current is:
a) Zero
b) Maximum
c) Proportional to the radius of the loop
d) Proportional to the square of the radius of the loop

Magnetic field strength is an important parameter in:
a) Magnetic resonance imaging (MRI)
b) Electric power generation
c) Wireless communication
d) Optical fiber transmission
Answer: a) Magnetic resonance imaging (MRI)

Magnetic field strength can be measured using a:
a) Voltmeter
b) Ammeter
c) Flux meter
d) Gauss meter