Ch 2 L2- The Magnetic Field due to a Current in a Circular Loop

A circular loop of wire carries a constant current of 0.8 A.The radius of the loop is 21 mm.Calculate the strength of the magnetic field at the centre of the loop.

Consider a circular ring of a radius of 8 cm carrying an electric current of intensity 5 A. The ring is bent to make one half of the ring perpendicular to the other half. Calculate the magnetic flux density at the center.

• 1

• 1/6

• 3/2

• 2/3

A thin, circular coil of wire with a radius 5.3 cm carries a constant current of 2.8 A.The coil has 41 turns of wire. What is the strength of the magnetic field at the center of the coil?

Consider a tightly wound, short coil of 50 turns, and a diameter of 15.2 cm. The current passing through the coil is 0.2 A. The magnetic flux density at the center of the coil is then equal to..........

Consider two current-carrying circular loops that are in the same plane and sharing the same centre C as shown in the figure below.

In the figure , two concentric circular loops carry the same current intensity 𝐼.Which of the following is the direction of the magnetic flux density 𝐵 at the centre of the circles C?

• Out of the screen

• Upwards

• Into the screen

• Downwards

Consider two circular coils that share the same centre; one has a radius of 15 cm and the other has a radius of 30 cm.Both coils carry an electric current of the same intensity but in a different direction. If the first coil has 50 turns, what should the number of turns of the second coil be so that the magnetic flux density at the centre of the coils vanishes?

• 25 turns

• 50 turns

• 100 turns

• 200 turns