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प्रश्न
What is the energy required to build up current of 1A in an inductor of 20 mH?
विकल्प
10 mJ
20 mJ
20 J
10 J
उत्तर
10 mJ
Explanation:
Step 1:
Let E = energy required
Substitute the given values from Question,
Let, inductance = L
Current = I
`L = 20 mH` ....(1)
`I = 1A` .....(2)
Applying the concept of Energy stored in the coil.
We get, `E = 1/2 LI^2` .....(3)
Step 2:
Substitute from (1), (2), and (3) and calculate:
`E = 1/2 LI^2`
`E = 1/2 xx 20 xx 10^-3 xx 1`
E = 10 mJ
संबंधित प्रश्न
Choose the correct option:
Two inductor coils with inductance 10 mH and 20 mH are connected in series. What is the resultant inductance of the combination of the two coils?
A long solenoid has turns per unit length 1.5 x 103 per meter and area of cross-section 25 cm2. A coil C of 150 turns is wound tightly around the center of the solenoid. For a current of 3 A in the solenoid, calculate
(a) the magnetic flux density at the centre of the solenoid
(b) the flux linkage in the coil C
(c) the average emf induced in coil C if the current in the solenoid is reversed in the direction in a time of 0.5 s. [µ0 = 4π x 10-7 H/m]
Find an expression for the power expended in pulling a conducting loop out of a magnetic field.
A 100 mH coil carries a current of 4 ampere. The energy stored in joules is ____________.
The current in coil changes from 0.6 A to 3 A in 0.06 s inducing a voltage of 8 V across it. Find initial energy stored in the coil.
Two inductor coils with inductance 10 mH and 20 mH are connected in series. What is the resultant inductance of the combination of the two coils?
Derive an expression for energy stored in the magnetic field in terms of induced current.
What is the energy required to built up a current of lA in an inductor of 20 mH?
