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Question
What is Lenz’s law?
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Solution
Lenz's law states that the direction of induced e.m.f. (or induced current) is such that it always tends to oppose the cause which produces it.
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RELATED QUESTIONS
State Lenz’s Law.
- How would you demonstrate that a momentary current can be obtained by the suitable use of a magnet, a coil of wire and a galvanometer?
- What is the source of energy associated with the current obtained in part (a)?
- Describe briefly one way producing an induced e.m.f?
- State one factor that determines the magnitude of induced e.m.f. in part (a) above.
- What factor determines the direction of induced e.m.f. in part (a) above?
Why does it become more difficult to move a magnet towards a coil when the number of turns in the coil has been increased?
The instantaneous magnetic flux in a circuit is `phi=4t^2-4t+1`. The total resistance of circuit is 15 Ω. At t = 2s, the induced current in circuit is ____________.
A magnet is moved towards a coil (i) quickly (ii) slowly. The induced potential difference.
A D.C generator works on the principle of ____________.
A vertical electric field of magnitude 4.9 × 105 N/C just prevents a water droplet of a mass 0.1 g from falling. The value of charge on the droplet will be: (Given g = 9.8 m/s2).
A conductor in the form of a circular arc of the radius of curvature R subtends an angle Ø at its centre of curvature. If the current in the conduct is I, the magnetic induction at the centre of curvature is ______.
State two factors on which the magnitude of induced e.m.f. in a coil depend.
