MHT CET · Physics · Alternating Current
An electric lamp connected in series with a capacitor and an a.c. source is glowing with certain brightness. On increasing the value of capacitance the brightness of the lamp
- A is increased.
- B is decreased.
- C remains the same.
- D becomes zero.
Answer & Solution
Correct Answer
(A) is increased.
Step-by-step Solution
Detailed explanation
The capacitive reactance is given by \(\mathrm{X}_{\mathrm{C}}=\frac{1}{2 \pi \mathrm{fC}}\) If capacitance \((\mathrm{C})\) is increased \(\mathrm{X}_{\mathrm{C}}\) will decrease. The total impedance of the circuit will decrease and hence current and brightness will increase.
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from Physics
- A proton moving in perpendicular magnetic field possess energy \(E\). The strength of magnetic field is increases four times. But the proton is constrained to move in the path of same radius. The kinetic energy of proton will increaseMHT CET 2022 Medium
- In an adiabatic expansion of a gas initial and final temperatures are \(T_1\) and \(T_2\) respectively then the change in internal energy of the gas is \(
\text { [R = gas constant, } \mathrm{Y}=\text { adiabatic ratio }]
\)MHT CET 2022 Easy - The charges \(2 \mathrm{q},-\mathrm{q},-\mathrm{q}\) are located at the vertices of an equilateral triangle. At the circumference of the triangleMHT CET 2023 Easy
- A metal surface having work function ' \(\mathrm{w}_{0}{ }^{\prime}\) emits photoelectrons when photons of energy 'E' are incident on it. The electron enters the uniform magnetic field (B) in perpendicular direction and moves in circular path of radius 'r'. Then 'r' is equal to (m and e be the mass and charge of electron respectively).MHT CET 2020 Hard
- Photoelectrons are emitted when photons of energy \(4.2 \mathrm{eV}\) are incident on a photosensitive metallic sphere of radius \(10 \mathrm{~cm}\) and work function \(2.4 \mathrm{eV}\). The number of photoelectrons emitted before the emission is stopped is
\(
\left[\frac{1}{4 \pi \epsilon_0}=9 \times 10^9 \text { SI unit; } \mathrm{e}=1.6 \times 10^{-19} \mathrm{C}\right]
\)MHT CET 2021 Medium - The collector supply voltage is 6 V and a voltage drop across a resistor of \(600 \Omega\) in the collector circuit is 0.6 V , in a circuit of transistor connected in common emitter mode. If the current gain is 20 then the base current isMHT CET 2024 Easy
More PYQs from MHT CET
- Which from following reactions is not possible for benzene due to reversible nature?MHT CET 2024 Medium
- Which of the following is not hydrogen like species?MHT CET 2022 Easy
- Identify the correct sequence of matches with the type of pollination and its characteristics.
a. Ornithophily 1. Nocturnal flower b. Entomophily 2. Light pollens c. Chiropterophily 3. Funnel shaped corolla d. Anemophily 4. Pleasant fragrance and nectar MHT CET 2019 Easy - Which hormone in barley and wheat seeds promotes germination by synthesizing amylase enzyme?MHT CET 2022 Medium
- Which is NOT an example of macro molecular colloid?MHT CET 2022 Easy
- Refractive index of a glass convex lens is \(1 \cdot 5\). The radius of curvature of each of the two surfaces of the lens is 40 cm . The ratio of the power of the lens when immersed in a liquid of refractive index 1.25 to that when placed in air isMHT CET 2025 Medium