Electromagnetic Induction
Physics ⇒ Electricity and Magnetism
Electromagnetic Induction starts at 10 and continues till grade 12.
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See sample questions for grade 10
A bar magnet is moved rapidly into a coil. The induced current is larger than when it is moved slowly. Explain why.
A coil of 100 turns is placed in a magnetic field. If the magnetic flux through the coil changes by 0.02 Wb in 0.1 s, what is the average induced emf?
A coil of 200 turns encloses an area of 0.01 m². It is placed perpendicular to a magnetic field of 0.5 T. If the field is reduced to zero in 0.2 s, what is the average induced emf?
A coil of 50 turns is removed from a magnetic field, reducing the flux from 0.1 Wb to 0 in 0.5 s. What is the induced emf?
A magnet is dropped through a coil connected to a sensitive galvanometer. The galvanometer shows a deflection as the magnet falls. Explain why.
A rectangular loop is moved with velocity v perpendicular to a uniform magnetic field B. What is the expression for the induced emf if the length of the side in the field is l?
A straight conductor of length 0.5 m moves at a speed of 2 m/s perpendicular to a magnetic field of 0.2 T. What is the induced emf?
Describe one practical application of electromagnetic induction in daily life.
Describe the difference between self-induction and mutual induction.
Explain why a current is induced in a coil when a magnet is moved towards it.
Explain why a current is induced in a conductor when it is moved through a magnetic field.
Explain why the induced current in a closed loop is zero if the magnetic field is parallel to the plane of the loop and does not change.
State Faraday's First Law of Electromagnetic Induction.
State Faraday's Second Law of Electromagnetic Induction.
State the law that explains the conservation of energy in electromagnetic induction.
What is the formula for the induced emf (e) in a coil of N turns when the magnetic flux changes by ΔΦ in time Δt?
What is the role of the core in a transformer?
Who discovered electromagnetic induction?
