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Network Elements and the Concept of Circuit

Easy Questions

Network Theory

Network Elements and the Concept of Circuit
Network theory miscellaneous
  1. The energy stored in the magnetic field at a solenoid 30 cm long and 3 cm diameter wound with 1000 turns of wire carrying a current of 10A, is—
    1. 0.015 joule
    2. 0.15 joule
    3. 0.5 joule
    4. 1.15 joule
Correct Option: B

We know

Energy =
µ. N2 A
I

=
4π × 10–7 × (1000)2 × π × (3 / 2 × 10–2) 2
30 × 10–2

= 0.15 joule.


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