Advertisements
Advertisements
प्रश्न
What is Lenz’s law?
Advertisements
उत्तर
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.
APPEARS IN
संबंधित प्रश्न
State Faraday's laws of electromagnetic induction.
State Lenz’s Law.
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 diagram in shows a coil of several turns of copper wire near a magnet NS. The coil is moved in the direction of arrow shown in the diagram.
- In what direction does the induced current flow in the coil?
- Name the law used to arrive at the conclusion in part (i).
- How would the current in coil be altered if
- the coil has twice the number of turns,
- the coil was made to move three times fast?
Explain the principle, construction and working of a dc motor.
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 ____________.
Magnetic flux passing through a coil is initially 6 x 10-4 Wb. It reduces to 10 % of its original value in 't' second. If the e.m.f. induced is 0.54 mV then 't' in second is ____________.
Two positively charged particles each having charge Q and are d distance apart. A third charge is introduced in midway on the line joining the two. Find nature and magnitude of third charge, so that the system is in equilibrium ______.
Explain how does the Lenz's law show the conservation of energy in the phenomenon of electromagnetic induction.
