Advertisements
Advertisements
प्रश्न
When an electric current is passed through a wire or a coil, a magnetic field is produced. Is the reverse phenomenon possible i.e, can a magnetic field produce an electric current? Explain with the help of an appropriate example.
Advertisements
उत्तर
Yes, the reserve phenomenon is possible.
Example: A changing magnetic field in one conductor causes induced current in another. This is sometimes referred to as electromagnetic induction.
APPEARS IN
संबंधित प्रश्न
A metal rod `1/sqrtpi `m long rotates about one of its ends perpendicular to a plane whose magnetic induction is 4 x 10-3 T. Calculate the number of revolutions made by the rod per second if the e.m.f. induced between the ends of the rod is 16 mV.
State three ways in which the strength of an electromagnet can be increased.
Describe one experiment to demonstrate the phenomenon of electromagnetic induction.
Name the following diagram and explain the concept behind it.

A coil has a self-inductance of 0·05 Henry. Find the magnitude of the emf induced in it when the current flowing through it is changing at the rate of 100 As-1.
State the condition at which we say the two coils kept close to each other are perfectly coupled with each other.
A thin semi-circular conducting ring (PQR) of radius r is falling with its plane vertical in a horizontal magnetic field B, as shown in the figure.

The potential difference developed across the ring when its speed v , is
Obtain an expression for motional emf from Lorentz force.
For making a strong electromagnet the material of the core should be ______.
A conductor of length 50 cm carrying a current of 5 A is placed perpendicular to a magnetic field of induction 2×10 -3T. Find the force on the conductor.
