Electromagnetic Induction
Physics ⇒ Electricity and Magnetism
Electromagnetic Induction starts at 10 and continues till grade 12.
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A coil of 200 turns is placed in a uniform magnetic field of 0.5 T. If the area of the coil is 0.02 m2 and the plane of the coil is perpendicular to the field, calculate the magnetic flux linked with the coil.
A metal rod of length 1 m moves with a velocity of 10 m/s perpendicular to a magnetic field of 0.2 T. What is the induced emf across the ends of the rod?
A rectangular loop of wire is pulled with constant velocity out of a region of uniform magnetic field. What happens to the induced current in the loop as it leaves the field?
A solenoid of length 0.5 m and 1000 turns carries a current that increases uniformly from 0 to 5 A in 0.1 s. If the cross-sectional area is 2 × 10-3 m2, calculate the average emf induced across the solenoid.
A straight conductor of length 0.5 m moves at a speed of 2 m/s perpendicular to a uniform magnetic field of 0.3 T. Calculate the emf induced across its ends.
A transformer has 500 turns in the primary coil and 100 turns in the secondary coil. If the input voltage is 220 V, what is the output voltage?
Define self-induction.
Describe the working principle of an electric generator based on electromagnetic induction.
Explain the difference between self-induction and mutual induction.
Explain why the induced current in a coil opposes the change in magnetic flux through it.
If the current in a coil changes at the rate of 5 A/s and the self-inductance of the coil is 2 H, what is the induced emf?
If the magnetic flux through a coil changes from 5 Wb to 2 Wb in 0.1 s, what is the average emf induced in the coil?
Mutual induction occurs when:
State Faraday's first law of electromagnetic induction.
The induced emf in a circuit is given by the formula: emf = -dΦ/dt. What does the negative sign indicate?
