Free Electromagnetism MCQs with Answers

• A. Deflect toward north
• B. Deflect toward south
• C. Move straight
• D. Move in circular path

Explanation: In this orientation, the magnetic force on the particle is perpendicular to its velocity, causing it to move in a straight line without…

• A. e/m =B r/E
• B. E/(B2r)
• C. E2/rB2
• D. B2/Er

Explanation: The currently accepted value for e/m is 1.758820 × 1011 C/kg. When an electron enters a region in which there is a uniform magnetic field…

• A. Inversely with r
• B. Inversely with r2
• C. Directly with r2
• D. Directly with r

Explanation: To find the magnetic field at a radius r inside the wire, draw a circular loop of radius r.

• A. Magnetic flux
• B. Magnetic induction
• C. Work done
• D. Magnetic Force

Explanation: The dimensions of magnetic field strength (B) are the same as those of magnetic induction, which is Newtons per Ampere-meter (N/A·m).

• A. µI2
• B. µ/I
• C. µI
• D. Iµ2

Explanation: Ampere's law states that the sum of the dot product of the tangential components of magnetic induction (B) and, the respective length of…

• 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

• A. Conductance
• B. Megnetic flux
• C. Electric current
• D. Elrctric flux

Explanation: The explanation of this question will be added soon!

• A. F = BA cosϴ
• B. F = μo NI
• C. F = q (v x B)
• D. F = I (L x B)

Explanation: Explanation:For a charge moving in a magnetic field the force is directly proportional to the charge, velocity of the charge carrier and…

• A. 2 N
• B. Zero
• C. 8 N
• D. 4 N

Explanation: Explanation:The force experienced by a charge moving in a magnetic field is given by the formula: F = qvBsinθWhere q is the charge, v is…

• A. 1.6 x 10^-19C
• B. 2.7 x 10^-19C
• C. 3.2 x 10^-19C
• D. 4.8 x 10^-19C

Explanation: The equation for this scenario is; Magnetic Force= Bqv sin(X) where B is the magnetic field strength, q is the charge and v is the…

• A. Only Magnitude
• B. Only direction
• C. Magnitude and direction
• D. Neither magnitude nor direction

Explanation: Electric forces change the magnitude and direction of velocity, as they exert a force on charged particles based on the electric field…

• A. 4π x 10-7 WbA-1m-1
• B. 4π x 102 WbA-2m-2
• C. 4π x 10-7 WbA-2m-1
• D. 4π x 102 WbA-1m-2

Explanation: Explanation: The value of permeability of free space μo is 4π × 10-7 WbA-1m-1.

• A. 1 Wb m-2 = N m-1 A-1
• B. 1 Tesla = 104 Gauss
• C. 1 Wb m-2 = 1 Tesla
• D. All of these

Explanation: Option D is the correct choice because all the given relations are accurate.

• A. τ = NIAB cos α
• B. τ = BIL sin α
• C. τ = NIAB sin α
• D. τ = BIL cos α

Explanation: The correct formula for the torque acting on a current-carrying coil is τ = NIAB cos α.

• A. Increasing magnetic field
• B. Increasing the number of turns of the coil
• C. Increasing the c/BAN ratio
• D. Decreasing the length of couple 'c'

Explanation: Sensitivity of a galvanometer is defined as the deflection per unit current.

• A. F = NIA cos α
• B. F = μnI
• C. F = ILB sin α
• D. F = ILA cos α

Explanation: The correct formula for the force exerted on a current-carrying conductor in a uniform magnetic field is F = ILB sin α.

• A. F/2
• B. 2F
• C. F/√2
• D. √2 F

Explanation: As we know, the force experienced by the current-carrying conductor is given by F'=IBLsinθ If θ= 45o F'=Fsin45° F'=F(0.707) F'=F/√2

• A. Half
• B. Double
• C. Eight-times
• D. Four-times

Explanation: As we know, the force experienced by the current-carrying conductor is given by F=IBL (sinθ=1) F'=IBLsinθ If = 90o If all other…

• A. 0°
• B. 30°
• C. 90°
• D. 60°

Explanation: The maximum force on a current-carrying conductor occurs when the current direction and the magnetic field's direction are perpendicular…