Question

A capacitor'c', a variable resistor 'r' and a bulb ob' are connected in series to the ac mains in circuit as shown. The bulb glows with some brightness. How will the glow of the bulb change if (i) a dielectric slab is introduced between the plates of the capacitor, keeping resistance r to be the same; (ii) the resistance r is increased keeping the same capacitance

Answer 1

Answer:

i) bulb will be brighter as capacitance of capacitor will inctease after inserting dielectric slab, then flow of charge will inctease due to which current will increase...

ii) bulb will be dimmer as increase in resistance will cause decrease in current flow through it......

You have not given the circuit diagram so I assumed that...

_______| |_____<><><>_____¤__

| capacitor resistance bulb

Hope it helps you