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Question
Choose the incorrect statement
Options
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
Solution
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.
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