Free Magnetic Flux MCQs with Answers

• A. B times A times cos theta, where theta is the angle between B and the normal to the surface
• B. B times A times sin theta
• C. B divided by A
• D. B times A only, whatever the orientation

Explanation: Flux counts the field lines threading the surface, so it is greatest when the field is perpendicular to the surface, meaning parallel to…

• A. parallel to the field
• B. perpendicular to the field
• C. at 45 degrees to the field
• D. irrelevant to the flux

Explanation: Flux depends on the cosine of the angle between the field and the normal to the coil, so it is maximum when the normal points along the…

• A. 1 weber
• B. 0.005 weber
• C. 100 weber
• D. 0.5 weber

Explanation: The flux through one turn is BA, that is 0.5 multiplied by 0.01, giving 0.005 Wb, and the flux linkage multiplies this by the 200 turns to…

• A. magnetic flux = flux density / area
• B. magnetic flux = flux density x area
• C. flux density = magnetic flux area
• D. flux density = magnetic flux x area

Explanation: Magnetic flux through an area is Φ = BA when the field is perpendicular to the area, where Φ is in Wb, B is in Wb m^-2, and A is in m^2.

• A. Zero
• B. Small but not zero
• C. Infinite
• D. Larger than 1

Explanation: The magnetic field vector makes a 90˚ angle with the area vector since area vector is always perpendicular to the surface we choose.

• A. Area of cross-section
• B. Number of turns
• C. Magnetic field
• D. None of these options is correct

Explanation: The magnetic flux linked with a coil is directly proportional to the number of turns in the coil.

• A. 1.5 mWb
• B. 0.15 mWb
• C. 0.015 mWb
• D. 15 mWb

Explanation: The magnetic flux through a surface is given by the formula: Φ = B A cosθ where: Φ = magnetic flux through the surface B = magnitude of…

• A. Area
• B. Vector area
• C. Unit area
• D. None of these

Explanation: Magnetic flux is the amount of magnetic field passing through a given area.

• A. Scalar
• B. Vector
• C. Simple
• D. None of these

Explanation: As we are using dot products, the magnetic flux is a scalar quantity. Note: When the magnetic field is along the area of the closed…

• A. BA cos(θ)
• B. BA
• C. B
• D. BA sin(θ)

Explanation: In physics, specifically electromagnetism, the magnetic flux through a surface is the surface integral of the normal component of the…

• A. B and V
• B. B and A
• C. B and I
• D. none of these

Explanation: Option B is correct since magnetic flux is the scalar product (dot product) of the magnetic field vector and area vector.

• A. -20 wb
• B. 30 wb
• C. 20 wb
• D. 80 wb

Explanation: The maximum flux through a loop of area A placed in a magnetic field B is given by the product of the area and the component of the…

• A. Zero
• B. Small but not zero
• C. Infinite
• D. Large but not infinite

Explanation: Option A is correct since if the surface is parallel to the field, then no field lines will cross that surface, and the flux through that…

• A. 10 Wb
• B. 15 Wb
• C. 20 Wb
• D. 0 Wb

Explanation: Given:Magnetic field vector, B = i + 5j + 2kArea vector, A = 6i - 2j + 2kThe magnetic flux (Φ) is given by the dot product of the magnetic…

• A. B and V
• B. B and A
• C. B and I
• D. None of these options are correct

Explanation: Magnetic Flux Φ is the dot / scalar product of magnetic flux density B, and cross-sectional area of coil A. Therefore, Φ = B.A.

• A. Wb.m-2
• B. Wb.m2
• C. Wb
• D. Tesla

Explanation: The unit of magnetic flux is the weber (Wb). In the CGS system, it is measured in maxwells.

• A. Magnetic field is perpendicular to the plane area
• B. Magnetic field lies parallel to the plane area
• C. Area is held at an angle of 45º
• D. Magnetic flux density is perpendicular to area vector of the surface

Explanation: When the magnetic field is perpendicular to the plane of the area (i.e., the angle θ between the magnetic field and the normal to the…

• A. Magnetic flux.
• B. Area of the coil.
• C. Shape of the coil.
• D. Resistance of the coil.

Explanation: The correct answer is 'magnetic flux.' According to Faraday's Law of Electromagnetic Induction, the induced electromotive force (EMF) in a…

• A. 0˚C
• B. 90˚C
• C. 60˚C
• D. 45˚C

Explanation: Magnetic flux is maximum when the angle between the magnetic field and the normal to the plane of finite area is 0 degree.

• A. 00
• B. 900
• C. All of these
• D. None of these

Explanation: Magnetic flux is maximum when the angle between the magnetic field and the normal to the plane of finite area is 00