electromagnetic induction
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22 questions
| 🇬🇧 | 🇬🇧 |
| Magnetic flux formula | Magnetic flux = B.A |
| Unit for magnetic flux | Weber (wb) and it is scalar |
| A cylindrical bar magnet is rotated about its axis. a wire is connected from the axis and is made to touch the cylindrical surface through a contact. explain current | As there is no change in magnetic flux associated with the circuit, no current is induced in the circuit. the ammeter A shows no deflection |
| Lenz's law and conservation of energy | The polarity of induced emf is such that it tends to produce a current which opposes the change in magnetic flux that produced it |
| Self inductance formula | L= mu(r).muo.n^2 AL |
| A metal plate is getting heated. it can be because | A current( either A.C. or D.C) is passing through her. it is placed in a time varying magnetic field |
| Mutual inductance formula | M21=muo.n1.n2.pi.r1^2l |
| Faraday's law of EMI | When a closed coil is placed in changing magnetic field then electric current is induced in the coil |
| If current is anticlockwise and clockwise explain the poles formed | North pole for anticlockwise and south pole for clockwise |
| Magnetic flux for n turns | Phi=nBA |
| Faraday's law given by | Micheal faraday in england and josheph henry in USA around 1830 |
| When north pole of magnet is pulled away from the coil then the galvanometer shows deflection in which direction | Opposite direction to the direction when magnet is brought closer |
| Conclusion of faraday's experiments | An induced emf is induced in acoil when a magnetic flux through the coil changes with time |
| Peak value of induced emf | E0=NBAW, e depends on time |
| Induced current in the loop | I=e/R depends on time |
| Induced charge | Qi= -dQ/R does not depend on time |
| Induced EMF formula | E= -dphi/dt |
| Direction of induced current | Always opposes the cause due to which it is produced |