When soft iron is placed inside a solenoid through which a bulb is connected in series, the glow of the filament of the bulb connected in that A.C circuit is.
Correct answer: B. Decreases
- A. Increases
- B. Decreases
- C. Same
- D. None
Explanation
Introducing a soft iron core greatly increases the solenoid's inductance (L). This leads to a higher inductive reactance (XL = 2πfL), which increases the total impedance of the circuit. The increased impedance reduces the overall current, causing the bulb to glow less brightly.
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About Alternating Current
Alternating current varies periodically, so phase relationships become essential when current passes through a resistor, capacitor or inductor. The chapter distinguishes resistance from capacitive and inductive reactance, explains phase lead and lag, and connects changing electric and magnetic fields with the production and properties of electromagnetic waves.
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