For L-R circuit, the time constant is equal to

Options

• Option A

  twice the ratio of the energy stored in the magnetic field to the rate of dissipation of energy in the resistance.

• Option B

  ratio of the energy stored in the magnetic field to the rate of dissipation of energy in the resistance.

• Option C

  half the ratio of the energy stored in the magnetic field to the rate of dissipation of energy in the resistance.

• Option D

  square of the ratio of the energy stored in the magnetic field to the rate of dissipation of energy in the resistance.