Hi
\tAccording to Lenz’s law:-The polarity of the induced emf is such that it tends to produce induced current in such a direction that it opposes the change in magnetic flux that produced it.\tThe (-) ive sign in given equatione= (-)\xa0(dΦ/dt)tells about the direction.

Yes ye NCERT ka nahi hai side book
No out of syllabus
The direction of induced current is such that it oppose the cause (change of magnetic flex) due to which it produced.
Bro humne toh Ncert may nhi dekha
No its related to lesson magnetic effect of electric current
Ya right..
Out of syllabus …. in class 11 or12

Thank You…..
Lenz’s law states that induced electromotive force with different polarities induces a current whose magnetic field opposes the change in magnetic flux through the loop in order to ensure that original flux is maintained through the loop when current flows in it.