QJEEM23Ph1b2f: JEE Main 2023 Physics - Class 12 JEEM23Ph1b2f Solution: The electric current in a circular coil of four turns produces…

By given information

$32 = 4 \times {{{\mu _0}i} \over {2r}}$ ..... (i)

Also, $r' = 4r$ ...... (ii)

and $B' = 1 \times {{{\mu _0}i} \over {2r'}}$ .... (iii)

$\Rightarrow B' = {{{\mu _0}i} \over {2(4r)}} = {{{\mu _0}i} \over {8r}} = {1 \over 8} \times 16 = 2\,T$