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प्रश्न
What do you mean by self-induction?
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उत्तर
If the magnetic flux is changed by changing the current, an emf is induced in that same coil. This phenomenon is known as self-induction.
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संबंधित प्रश्न
When the current changes from +2A to −2A in 0.05 s, an emf of 8 V is induced in a coil. The co-efficient of self-induction of the coil is
A circular coil with a cross-sectional area of 4 cm2 has 10 turns. It is placed at the centre of a long solenoid that has 15 turns/cm and a cross-sectional area of 10 cm2. The axis of the coil coincides with the axis of the solenoid. What is their mutual inductance?
What is meant by mutual induction?
Define self-inductance of a coil interms of
- magnetic flux and
- induced emf
How will you define the unit of inductance?
Give the physical significance of self-inductance of a coil.
An inductor of inductance L carries an electric current i. How much energy is stored while establishing the current in it?
Determine the self-inductance of 4000 turn air-core solenoid of length 2m and diameter 0.04 m.
A long solenoid having 400 turns per cm carries a current 2A. A 100 turn coil of cross-sectional area 4 cm2 is placed co-axially inside the solenoid so that the coil is in the field produced by the solenoid. Find the emf induced in the coil if the current through the solenoid reverses its direction in 0.04 sec.
The solenoids S1 and S2 are wound on an iron-core of relative permeability 900. The area of their cross-section and their length are the same and are 4 cm2 and 0.04 m, respectively. If the number of turns in S1 is 200 and that in S2 is 800, calculate the mutual inductance between the coils. The current in solenoid 1 is increased from 2A to 8A in 0.04 second. Calculate the induced emf in solenoid 2.
