Free Magnetic Flux Density MCQs with Answers

• A. 1 tesla
• B. 10-3tesla
• C. 10 tesla
• D. 10-4tesla

Explanation: We know that:1 Tesla = 104Gauss=> 1 gauss = 10-4 TeslaBoth Tesla and Gauss are units of magnetic induction.Electromagnetic or magnetic…

• A. An isolated magnetic pole
• B. Static electric charge
• C. Nonmagnetic substance
• D. Current loop

Explanation: A current loop, such as a wire carrying electric current in a circular path, creates a magnetic field around it.

• A. Lines start at north pole and ends at south pole
• B. Lines never touch or cross each other
• C. The lines are curved
• D. The magnetic field is strongest when the lines are farthest.

Explanation: Option D is Incorrect because the magnetic field is strongest where the lines are closest together, indicating a higher field strength.

• A. Wbm⁻¹
• B. Wbm
• C. Wbm-2
• D. Wb

Explanation: Option C is Correct, as it correctly represents Weber per square meter (Wb/m² or Tesla, T).

• A. Wire in a helix around a box
• B. Wire in a helix around a cylindrical surface
• C. Wire in a helix on a plain surface
• D. Cannot be made using wire

Explanation: A solenoid is an instrument that consists of copper coiling over a cylinder designed to create a strong magnetic field inside the coil…

• A. 1N
• B. 1/2 N
• C. 1/3 N
• D. 1/4 N

Explanation: Answer; B (Answer should be A) F=BILsintheta theta= 90° F= 0.5× 2× 1× sin90 = 1 N

• A. will attract each other
• B. will repel each other
• C. will have no effect on each other
• D. None of the above

Explanation: If two parallel wires carry current in opposite directions, they repel each other, whereas if two parallel wires carry current in the same…

• A. B = µ°NI ℓ
• B. B = µ ℓ / °Nℓ
• C. B = Nℓ / °ℓ
• D. B = µ ℓ ℓ / °N

Explanation: According to Ampere's law, the magnetic field (B) produced inside a solenoid is directly proportional to the product of the permeability…

• A. 1.2N
• B. 3 dynes
• C. 10^7 dynes
• D. 10^5 dynes

Explanation: This option is correct as 10^7 dynes are equal to 100N. The force can be calculated by: F = BILsinθ In this case, the cylinder is carrying…

• A. Attracted by poles
• B. Attracted by North pole & repelled by south pole
• C. Attracted by south pole & repelled by North pole
• D. Repelled by the poles

Explanation: Diamagnetic substances are those that do not have unpaired electrons in their atoms.

• A. Magnetic flux
• B. Magnetic flux density
• C. Magnetic permeability
• D. None of these

Explanation: The force exerted on a wire of length one meter carrying a current of one ampere lying normal to the magnetic field is called magnetic…

• A. 10A
• B. 50A
• C. 100A
• D. 500A

Explanation: Given that:Length = L = 10cm = 10 × 10-2 mMagnetic field = B = 0.5TForce = F = 5NCurrent = I =?The force experienced by a current-carrying…

• A. attract each other
• B. repel each other
• C. have no force of attraction or repulsion
• D. remain stationary

Explanation: Parallel wires with current in the same direction exert attractive forces on eachother.

• A. 2 x 10^-5N to the left
• B. 3 x 10^-5N to the right
• C. 5 x 10^-5N to the right
• D. 5 x 10^-5N to the left

Explanation: Two parallel current carrying wires experience equal, but opposite magnetic force.

• A. Hysteresis
• B. Ferromagnetism
• C. The Curie law
• D. Gauss's law for magnetism

Explanation: Magnetic hysteresis occurs when an external magnetic field is applied to a ferromagnet such as iron and the atomic dipoles align…

• A. Surface
• B. Closed surface
• C. Path
• D. Closed path

Explanation: Ampere's law states that the total magnetic field (B) induced around any closed path is equal to the ratio of the total current passing…