Objective Question on Steady Magnetic Fields

Objective Question on Steady Magnetic Fields

Objective Question on Steady Magnetic Fields, objective questions on magnetic effects of electric current, MCQs on Steady Magnetic Fields, Multiple Choice Questions on Steady Magnetic Fields, Magnatisem multiple-choice questions, Magnetic Effects, and steady Current MCQs, magnetic field questions and answers.

Multiple Choice Questions

If flux density is 10 wb/m² and the area of the coil is 2 m², the flux is

• 10 wb
• 20 wb
• 5 wb
• 40 wb

Answer: 20 wb

If the magnetic field, H = 4a_x, A/m, flux density in free space is

• 1.6πa_xμ wb/m²
• 16πa_x μ wb/m²
• 1.6πμ wb/m
• 160π a_x wb/m

Answer: 1.6πa_xμ wb/m²

If the curl of the magnetic field is 2.0a_x A/m², the current density is

• 2.0a_x A/m²
• 1.0a_x A/m²
• 2.0 A/m
• 1.0 A/m

Answer: 2.0a_x A/m²

\oint (\bigtriangledown \times H).dS is

• zero
• I_enc
• J
• \oint H.dS

Answer: zero

If a charge of 2.0 C is placed in an electric field of 2.0 V/m, the force on the charge is

• 4.0 N
• 1.0 N
• 2.0 N
• zero

Answer: 4.0 N

If a charge, 1.0 C is moving with a velocity 2.0a_x in a magnetic field of B = 1.0a_y, the force on the charge is

• 2.0a_z
• 1.0a_y
• 2.0a_x
• 1.0a_z

Answer: 2.0a_z

The force produced by B = 2.0 wb/m² on a current element of 2.0 A-m, is

• 4.0 N
• 1.0 N
• 2.0 N
• 0.5 N

Answer: 4.0 N

The magnetic field in an ideal conductor is

• zero
• infinite
• finite
• the same as its outside field

Answer: zero

If the normal component of B in medium 1 is 1.0a_x wb/m , the normal component in medium 2 is

• 0.5a_x wb/m²
• 1.0a_x wb/m²
• 2.0a_x wb/m²
• 1.0 wb/m²

Answer: 1.0a_x wb/m²

The unit of scalar magnetic potential is

• Ampere
• Volt
• Amp/m
• Volt/m

Answer: Ampere

∇ × ∇ V_m is

• zero
• ∇²
• j
• ∇.∇V_m

Answer: zero

∇ × A is

• H
• B
• j
• 0

Answer: B

Torque has the unit of

• N-m
• N/m
• N-m²
• N

Answer: N-m

Magnetisation, M is defined as

• χ m H
• χm μ₀ H
• χ_m B
• B/μ₀

Answer: χ m H

The unit of magnetic dipole moment is

• A-m
• A-m²
• A/m
• C-m

Answer: A-m²

The dipole moment of a magnet is

• Q_m d
• Q_m d
• Q_m I
• Q_m S

Answer: Q_m d

If μ= 10μH/m for a medium, H = 2.0 A/m, the energy stored in the field is

• 0.5 J/m³
• 1.0 μJ/m³
• 2.0 μJ/m³
• 1.0 J/m³

Answer: 2.0 μJ/m³

If a current of 1.0 amp flowing in an inductor, L = 2 Henry, the energy stored in inductance is

• 2.0 J
• 1.0 J
• 2.0 J/m³
• 0.5 J

Answer: 1.0 J

\oint B.dS is

• zero
• Q
• H
• J

Answer: zero

The unit of magnetic susceptibility is

• Nil
• Amp
• H/m
• Wb

Answer: Nil