Knockout BITSAT 2021
It is an exhaustive preparation module made exclusively for cracking BITSAT..
Two coaxial solenoids 1 and 2 of the same length are set so that one is inside the other. The number of turns per unit length are n1 and n2. The currents i1 and i2 are flowing in opposite directions. The magnetic field inside the inner coil is zero. This is possible when
i1≠i2 and n1=n2
i1=i2 and n1≠n2
i1=i2 and n1=n2