Question
If the frequency of an A.C is made 4 times of its initial value, the inductive reactance will.
✓
Answer
- be 4 times
inductive reactance $=2\pi\text{fL}$
therefore when f is made 4 times, inductive reactance also becomes 4 times
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
The induction coil works on the principle of.
A coil having $N$ turns is wound tightly in the form of a spiral with inner and outer radii $a$ and $b$ respectively. When a current $I$ passes through the coil, the magnetic field at the centre is
→Which causes the formation of rainbow ?
Free $^{238}U$ nuclei kept in a train emit alpha particles. When the train is stationary and a uranium nucleus decays, a passenger measures that the separation between the alpha particle and the recoiling nucleus becomes $x$ in time $t$ after the decay. If a decay takes place when the train is moving at a uniform speed $v,$ the distance between the alpha particle and the recoiling nucleus at $a$ time $t$ after the decay, as measured by the passenger will be:
→The current $i$ in an induction coil varies with time $t$ according to the graph shown in figure. Which of the following graphs shows the induced $emf (e)$ in the coil with time
→A wire carrying current $i$ is shaped as shown. Section $AB$ is a quarter circle of radius $r.$ The magnetic field is directed
→The equivalent capacitance of the combination shown in figure is:
The maximum current that flows through a fuse wire before it blows out varies with its radius as
A parallel plate capacitor is charged to $60\ \mu\text{c}$ Due to a radioactive source, the plate loses charge at the rate of $1.8\times10^{-8}\frac{\text{C}}{\text{s}}$ The magnitude of displacement current is :
→According to Huygens, the ether medium pervading entire universe is: