AIPMT 2013 Physics and Chemistry Paper

Brightness of the bulb
● decreases when an iron rod is inserted in the coil as impedance of circuit increases.
● increases when frequency of the AC source is decreased as impedance of circuit decreases.
● Increases when number of turns in the coil is reduced as impedance of circuit decreases.
● increases when a capacitance of reactance XC=XL is included in the circuit as impedance of circuit decreases.