Question

Choose the incorrect statement

• A. Fleming’s right-hand rule is a simple rule to know the direction of induced current.
• B. The right-hand thumb rule is used to find the direction of magnetic fields due to current-carrying conductors.
• C. The difference between the direct and alternating currents is that the direct current always flows in one direction, whereas the alternating current reverses its direction periodically.
• D. In India, the AC changes direction after every $1/50$ second.

Answer 1

The correct option is D

In India, the AC changes direction after every $1/50$ second.

The explanation for the correct option:

In the case of option $\mathrm{D}$

1. The charge at which alternating cutting-edge reverses path is known as its frequency expressed in hertz. Thus, the preferred family advanced in India is$50\mathrm{Hz}$. $\mathrm{AC}$ power alternates back-and-forth in path instances according to$2\mathrm{d}$, in keeping with the electric machine within the country.
2. The rate on the ends of the twine alternates between negative $(-)$ and effective $(+)$. If the rate is negative $(-)$, that pushes the negatively charged electrons far from that terminal. If the rate is effective $(+)$, the electrons are attracted in that path.
3. Thus, the power withinside the twine actions in a single path for a brief while reversing its path while the generator armature is in a unique position. The path modifications two times in every cycle so that extrude of the path takes location after each $1/\mathrm{one}\mathrm{hundred}2\mathrm{d}$

The explanation for incorrect options:

In the case of option $\mathrm{A}$

1. Fleming's proper-hand rule indicates the path of caused cutting-edge while a conductor actions in a magnetic field.
2. The proper hand is held with the thumb, first finger, and $2\mathrm{d}$ finger together perpendicular to every other at proper angles.
3. Hence option $\mathrm{A}$ is incorrect.

In the case of option $\mathrm{B}$

1. The thumb represents the path of Motion of the conductor.
2. The First finger represents the path of the Field (north to south).
3. The Second finger represents the path of the caused or generated Current the path of the caused cutting-edge can be the path of traditional cutting-edge; from effective to negative.
4. Hence option $\mathrm{B}$ is incorrect.

In the case of option $\mathrm{C}$

1. Current is the motion of electrons through a conductor, like a twine. In $\mathrm{DC}$, the electrons go with the drift step by step in an unmarried path or ahead and its significance stays constant. In $\mathrm{AC}$, electrons hold switching directions, from time to time going ahead after which going backward.
2. The significance of $\mathrm{AC}$ cutting-edge varies with time.
3. Hence option $\mathrm{C}$ is incorrect.

Therefore, option ($\mathrm{D}$) is correct.