Choose the incorrect statement : - Vidyadip

MCQ

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.
✓
In India, the $AC$ changes direction after every $\frac{1}{50}$ second.

✓

Answer

Correct option: D.

In India, the $AC$ changes direction after every $\frac{1}{50}$ second.

Frequency of $AC$ in India $= 50Hz$
$\therefore AC$ completes $1$ cycle in $\frac{1}{50}$ seconds.
In one cycle $, AC$ changes direction two times. Hence, time after which $AC$ changes direction,
$=\frac{1}{2\times50}=\frac{1}{100}\text{ second}.$

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