Choose in incorrect statemetn:

Options

A. Fleming's right hnd rule is a simple rule of to know the direction of induced current.
B. The rigth hand thumb rule is used to find the direction of magnetic fields due to currect carrying conductors.
C. The difference between the direct and alternating current is that the direct current alwys flows in one direction, where as the alternating cuurrent reverses its direction periodically.
D. In India, the AC changes direction after every `(1)/(50)` second.

Answer

D

Explanation

According to Fleming's right hand rule, if the direction of magnetic filed and the direction of motion of conductor are given then we can find the direction of the induced current. So option (a) is correct.
(b) In the right-hand thumb rule, we find the direction of magnetic field due to a straight current-carruyingg conductor. Thus option (b) is correct.
(c) The direction and magnitude of AC changes periodically wheras in case of DC these remains constant. SO option (c) is also correct.
(d) The frequency of 'AC' in India is 50 cyclel/s. Therefore, time period of AC is 1/50 s. But AC changes its diretion after every half time peridd, i.e.,
`1//(2xx50)` i.e., /100s.
Thus in India. the AC changes direction after every 1/100s. Hence option (d) is incorrect.