[amp_mcq option1=”Resistances provide the only opposition to current flow” option2=”Inductive reactance provides the only opposition to current flow” option3=”Combinations of resistance and inductive reactance provide any opposition to current flow” option4=”The ac voltage lags the current by 90 degree E. None of the above” correct=”option2″]
The correct answer is: B. Inductive reactance provides the only opposition to current flow.
A purely inductive circuit is a circuit that contains only inductance and no resistance. In such a circuit, the only opposition to current flow is inductive reactance, which is given by the formula $X_L = 2\pi f L$, where $f$ is the frequency of the applied voltage and $L$ is the inductance of the circuit.
Inductive reactance is a reactive impedance, which means that it does not dissipate power. Instead, it stores energy in the magnetic field of the inductor. This energy is then released back into the circuit when the current reverses direction.
The phase angle between the current and voltage in a purely inductive circuit is 90 degrees. This means that the current leads the voltage by 90 degrees.
Options A, C, and E are incorrect because they do not accurately describe a purely inductive circuit. Option A states that resistances provide the only opposition to current flow. However, in a purely inductive circuit, there is no resistance. Option C states that combinations of resistance and inductive reactance provide any opposition to current flow. However, in a purely inductive circuit, there is no resistance. Option E states that none of the above is true. However, option B is true, so option E must be incorrect.