enEnglishguગુજરાતી
GUJCET · Physics · Alternating Current
A capacitor ' \(C\) ' is connected across a DC source, the reactance of the capacitance will be ____________ .
- A Zero
- B High
- C Low
- D Infinite
Answer & Solution
Correct Answer
(D) Infinite
Step-by-step Solution
Detailed explanation
(D) Infinite
DC circuit \(v=0\)
\(
\begin{array}{ll}
\therefore & \mathrm{X}_{\mathrm{C}}=\frac{1}{2 \pi \nu \mathrm{C}} \\
\therefore & \mathrm{X}_{\mathrm{C}}=\frac{1}{0} \\
\therefore & \mathrm{X}_{\mathrm{C}}=\text { Infinite }
\end{array}
\)
DC circuit \(v=0\)
\(
\begin{array}{ll}
\therefore & \mathrm{X}_{\mathrm{C}}=\frac{1}{2 \pi \nu \mathrm{C}} \\
\therefore & \mathrm{X}_{\mathrm{C}}=\frac{1}{0} \\
\therefore & \mathrm{X}_{\mathrm{C}}=\text { Infinite }
\end{array}
\)
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
- The dimensional formula of capacitance is __________ .Take Q as the dimension formula of charge.GUJCET 2017 Hard
- The force between two point charges placed in a material medium of dielectric constant \(K\) is \(F\). If the material is removed, then the force between them becomes _________.GUJCET 2013 Easy
- The internal resistance of a cell of emf 4 V is \(0.1 \Omega\). It is connected to a resistance of \(3.9 \Omega\). The voltage across the cell will be _________.GUJCET 2008 Easy
- An air-cored solenoid with \(3 0 ~ c m\) length and area of cross section \(25 cm^2\) and number of turns 500 , carries a current of 2.5 A . The current is suddenly switched off in a brief time of \(10^{-3} s\). How much is the average back emf induced across the ends of the open switch in the circuit ? Ignore the variation in magnetic field near the ends of the solenoid?GUJCET 2022 Easy
- A tank is filled with water to a height of 16 cm . Find the apparent depth of a needle lying at the bottom of the tank is measured by a microscope. Refractive index of water \(\left(\mu_{w}\right)\) is \(\frac{4}{3}\)GUJCET 2021 Easy
- A pair of adjacent coils has a mutual inductance of 1.5 H . If the current in one coil changes from 0 to 20 A in 0.5 sec . What is the change of flux linkage with the other coil ?GUJCET 2021 Easy
More PYQs from GUJCET
- At a place on Earth, the vertical component of Earth's magnetic field is \(\sqrt{3}\) times its horizontal component. The angle of dip at this place is ________.GUJCET 2015 Easy
- A coil having \(10 Am ^2\) magnetic moment is placed in a vertical plane and is free to rotate about its horizontal axis coincides with its diameter. A uniform magnetic field of 2 T in the horizontal direction exists such that initially the axis of the coil is in the direction of the field. The coll rotates through an angle of \(90^{\circ}\) under the influence of magnetic field. The moment of inertia of coil is \(0.1 kg m ^2\). What will be its angular speed ?GUJCET 2020 Easy
- IUPAC name of vinyl cyanide is __________.GUJCET 2013 Hard
- Area of triangle having vertices \(A (k, 1), B (2,4)\), \(C (1,1)\) is 6 sq. units then \(k=\) __________ .GUJCET 2023 Medium
- Which of the following will give \(H _{2(g)}\) at cathode and \(O _{2(g)}\) at anode on g electrolysis using platinum electrodes?GUJCET 2014 Easy
- The particular solution of \(e^{\frac{\phi y}{\Delta x}}=x, y(1)=3, x > 0\) is ____________ .GUJCET 2018 Medium