Magnetism II - SS3 Physics Past Questions and Answers - page 1
Which of the following devices uses electromagnetism to function?
Camera
Mobile phone
Compass
Calculator
Which of the following is a key component of electric motors?
Capacitor
Resistor
Inductor
Diode
Which of the following is an application of electromagnetism in medicine?
X-ray machines
Laser surgery
Magnetic resonance imaging (MRI)
Ultrasound machines
Which of the following is an application of electromagnetism in transportation?
Aeroplanes
Cars
Trains
Bicycles
Which of the following is an application of electromagnetism in data storage?
CDs
Hard drives
Floppy disks
USB drives
Explain the application of magnetism to transportation technology
Magnetism has helped transportation technology through the creation of vehicles like the Maglev train. Maglev trains use magnetic fields to levitate above the tracks and travel at high speeds. They work by using magnetic repulsion to lift the train off the tracks and then using magnetic attraction to propel the train forward.
How has the knowledge of magnetism impacted medical technology
The knowledge of magnetism has impacted medical technology though machine line the Magnetic resonance imaging (MRI), which uses powerful magnetic fields and radio waves to produce detailed images of the body's internal structures. The magnetic fields interact with the protons in the body's tissues, creating a signal that can be detected and used to create an image.
What is Faraday's law of electromagnetic induction?
The induced emf in a closed loop is proportional to the rate of change of magnetic flux through the loop.
The magnetic field induced by a current-carrying conductor is proportional to the current and inversely proportional to the distance from the conductor.
The direction of the magnetic force on a moving charged particle is perpendicular to both the particle's velocity and the magnetic field.
The induced magnetic field in a closed loop is proportional to the rate of change of the electric field through the loop.
What is the unit of magnetic flux?
Ohm
Coulomb
Weber
Tesla
An electric generator works based on which of the following principles?
Ampere's law
Faraday's law
Lenz's law
Coulomb's law