QUIZ II - PHY 504 - AY 2025-26 - 26-09-25

Two current carrying wire carrying current in the same direction will experience

• Mutual Attraction

• Mutual Repulsion

• Torque and Rotation

• None of the Above

A long solenoid is formed by winding 20 turns per cm. What current is necessary to produce a magnetic field of 40 mT inside the solenoid?

• 2A

• 4A

• 8A

• 16A

Unit of volume current density and volume charge density are

• Ampere/(m^2)

  and

  Coulomb/(m^3)

  respectively

• Ampere/(m^3)

  and

  Coulomb/(m^2)

  respectively

• Ampere/(m^2)

  and

  Coulomb/(m^2)

  respectively

• Ampere/(m^2)

  and

  Coulomb/(m)

  respectively

Find the total magnetic flux through a closed loop due to a current carrying wire carrying uniform current I in the wire with radius R.

• πR²I
• I
• 0.5I
• 0

According to Lenz's Law induced emf is proportional to

• Total Electric Flux

• Total Magnetic Flux

• Total Current

• None of the above

Two long, straight wires carrying electric currents 10A in opposite directions. The separation between the wires is 5.0 cm. Find the magnetic field at a point P midway between the wires.

• 80 micro Tesla

• 40 micro Tesla

• 160 micro Tesla

• 240 micro Tesla

Which one of the following is not an example of a conductor

• Iron

• Silver

• Wood

• Gold

Which of the following is not an example of a ferromagnetic material?

• Iron

• Nickel

• Cobalt

• Aluminium

What is the formula for the magnetic field strength (B) inside a long solenoid?

• B = I/μ₀

• B = μ₀I

• B = μ₀nI

• B = nI

When the current in a coil is increased, what happens to the magnetic field strength around the coil?

• It decreases

• It remains constant

• It increases

• It becomes zero