Take this Quiz: A-Level Physics: Magnetic Fields and Induction | Zestly

Question 1

A straight wire of length 0.25 m carries a current of 4.0 A. It is placed at an angle of 30 degrees to a uniform magnetic field of flux density 0.80 T. Calculate the magnitude of the magnetic force acting on the wire.

Accepted Answer

0.40 N

Question 2

A proton with charge $1.6 	imes 10^{-19} 	ext{ C}$ enters a uniform magnetic field of 0.50 T moving at a velocity of $2.0 	imes 10^6 	ext{ m/s}$ perpendicular to the field. Which of the following statements are true regarding the motion of the proton?

Accepted Answer

The magnetic force acts as a centripetal force.

Question 3

A square coil with 50 turns and a side length of 0.10 m is placed in a uniform magnetic field of 0.20 T. The plane of the coil is perpendicular to the field lines. Calculate the magnetic flux linkage through the coil.

Accepted Answer

0.10 Wb

Question 4

A coil of 200 turns has a magnetic flux through it that changes from 0.02 Wb to 0.06 Wb in 0.50 seconds. What is the magnitude of the average induced EMF in the coil?

Answer

4 V

Answer

8 V

Answer

12 V

Answer

16 V

Question 5

An ideal transformer has 1000 turns on the primary coil and 200 turns on the secondary coil. If the primary voltage is 240 V, which of the following are true?

Answer

The secondary voltage is 48 V.

Answer

The transformer is a step-up transformer.

Answer

The power output is greater than the power input.

Answer

The turns ratio is 5:1.