Question

Choose the incorrect statement

विकल्प

• Fleming’s right-hand rule is a simple rule to know the direction of induced current

• The right-hand thumb rule is used to find the direction of magnetic fields due to current carrying conductors

• 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 `1/50` second

Answer 1

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

Explanation - 

Here option (a), (b) and (c) are knowledge-based options and are correct.

Option (d) is incorrect because the frequency of 'AC' in India is 50 cycles/s. So, the time period of AC is `1/50` s.  We know that AC changes its direction after every half time period, i.e., `1/(2 xx 50)` or `1/100` s. So, in India, the AC changes direction after every `1/100` s.