JEE Mains · Physics · STD 12 -7. Alternating current
A bulb and a capacitor are connected in series across an AC supply. A dielectric is then placed between the plates of the capacitor. The glow of the bulb:
- A increases
- B remains same
- C becomes zero
- D decreases
Answer & Solution
Correct Answer
(A) increases
Step-by-step Solution
Detailed explanation
\(\mathrm{Z}=\sqrt{\mathrm{R}^2+\mathrm{X}_{\mathrm{C}}^2} \& \mathrm{X}_{\mathrm{C}}=\frac{1}{\mathrm{WC}}\) due to dielectric \(\mathrm{C} \uparrow \Rightarrow \mathrm{X}_{\mathrm{c}} \downarrow \Rightarrow \mathrm{Z} \downarrow\) So, current increases & thus bulb will glow…
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