MCQ
A capacitor becomes a perfect insulator for:
- AAlternating current
- ✓Direct current
- CBoth $(a)$ and $(b)$
- DNone of these
✓
Answer
Correct option: B.
Direct current
A capacitor becomes a perfect insulator for direct current as the regular supply of current charges capacitor and the it behaves as open circuit, where as in $A.C.$ the current being variable in sign and magnitude does not charge capacitor ever it goes through a repetitive process of charging and discharging and hence it never behaves as open circuit.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
A current carrying rectangular coil is placed in a uniform magnetic field. In which orientation, the coil will not tend to rotate
A beam consisting of protons and electrons moving at the same speed goes through a thin region in which there is a magnetic field perpendicular to the beam. The protons and the electrons:
The magnitude of electric field $E$ in the annular region of a charged cylindrical capacitor
→Why a $DVD$ stores almost $30$ times more information than a $CD$?
→Which of the following products in a hydrogen atom are independent of the principal quantum number n? The symbols have their usual meanings.
Radius of the first orbit of the electron in a hydrogen atom is 0.53 Å. So, the radius of the third orbit will be
Metal rod moves at a constant velocity in a direction perpendicular to its length. A constant uniform magnetic field exist in space in a direction perpendicular to the rod as well as its velocity. Select the correct statement from the following
In the following Wheatstone bridge P/Q = R/S. If key K is closed, then the galvanometer will show deflection
The phase difference between the voltage and the current in an ac circuit is $\pi /4$. If the frequency is $50\, Hz$ then this phase difference will be equivalent to a time of
→Assertion : In Lyman series, the ratio of minimum and maximum wavelength is $\frac{3}{4}$.
→Reason : Lyman series constitute spectral lines corresponding to transition from higher energy to ground state of hydrogen atom.