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प्रश्न
What do you understand by self-inductance of a coil?
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उत्तर
Self-inductance or simply inductance of a coil is defined as the flux linkage of the coil when 1A current flows through it.
When the current i changes with time, an emf is induced in it. From Faraday’s law of electromagnetic induction, this self-induced emf is given by
`epsilon = - ("d"("N"Φ_"B"))/"dt" = ("d" ("Li"))/"dt"`
`therefore epsilon = - "L""di"/"dt"` or L = `(-epsilon)/("di"//"dt")`
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संबंधित प्रश्न
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 do you mean by self-induction?
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.
Assuming that the length of the solenoid is large when compared to its diameter, find the equation for its inductance.
Show that the mutual inductance between a pair of coils is same (M12 = M21).
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.
