Electromagnetic Induction
Physics ⇒ Electricity and Magnetism
Electromagnetic Induction starts at 10 and continues till grade 12.
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A coil of 100 turns is placed in a uniform magnetic field. If the magnetic flux through each turn changes by 0.02 Wb in 0.1 s, what is the average induced emf?
A coil of 200 turns is placed in a magnetic field. If the magnetic flux changes from 0.3 Wb to 0 in 0.5 s, calculate the average induced emf.
A magnet is dropped through a coil connected to a galvanometer. The galvanometer shows a deflection. Explain why.
A rectangular loop of wire is pulled out of a magnetic field at a constant speed. What is the direction of the induced current?
A solenoid of 500 turns has a magnetic flux of 0.1 Wb through each turn. If the flux drops to zero in 0.2 s, calculate the average induced emf.
A straight conductor of length 0.5 m moves at a speed of 2 m/s perpendicular to a magnetic field of 0.3 T. What is the induced emf?
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 the core of a transformer is made of laminated iron sheets.
If the rate of change of magnetic flux is 0.5 Wb/s and the coil has 20 turns, what is the induced emf?
State Faraday's first law of electromagnetic induction.
State Lenz's law of electromagnetic induction.
State the mathematical expression for Faraday's law of electromagnetic induction.
What is the role of eddy currents in electromagnetic induction?
Who discovered electromagnetic induction?
A circular coil of radius 0.2 m and 50 turns is placed perpendicular to a uniform magnetic field of 0.5 T. If the coil is rotated by 90° in 0.1 s, calculate the average induced emf in the coil.
A metal rod of length 0.4 m moves with a velocity of 3 m/s perpendicular to a magnetic field of 0.2 T. Calculate the magnitude of the induced emf between the ends of the rod.
A rectangular loop of wire with area 0.02 m² is placed in a uniform magnetic field of 0.3 T. The plane of the loop is initially perpendicular to the field and is rotated to be parallel to the field in 0.05 s. What is the average induced emf?
A transformer has 200 turns in the primary coil and 1000 turns in the secondary coil. If the input voltage is 120 V, what is the output voltage?
Explain why the induced emf in a coil is zero when the magnetic field is constant, even if the field is strong.
