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KCET2014PhysicsAlternating Current

A solenoid of inductance ( 2 H ) carries a current of ( 1 ~A ). What is the magnetic energy stored in a solenoid?

Options

  1. A( 12 ~J )
  2. B( 1 ~J )
  3. C(1)
  4. D( 05 ~J )

Correct answer

B. ( 1 ~J )

Step-by-step solution

Energy stored in a solenoid is given as [ E= 1 2 L I² ] Given, inductance of solenoid, ( L =2 H ); current in solenoid, ( I =1 ~A ) Therefore ( E= 1 2 2 1²=1 ) Thus, energy stored in solenoid = ( 1 ~J )

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