jee-main 2004 Q54

jee-main · India Not Maths
A long wire carries a steady current. It is bent into a circle of one turn and the magnetic field at the centre of the coil is $B$. It is then bent into a circular loop of $n$ turns. The magnetic field at the centre of the coil will be
(1) $nB$
(2) $n ^ { 2 } B$
(3) $2 n B$
(4) $2 n ^ { 2 } B$ 
A long wire carries a steady current. It is bent into a circle of one turn and the magnetic field at the centre of the coil is $B$. It is then bent into a circular loop of $n$ turns. The magnetic field at the centre of the coil will be\\
(1) $nB$\\
(2) $n ^ { 2 } B$\\
(3) $2 n B$\\
(4) $2 n ^ { 2 } B$
Paper Questions
Q3 Q4 Q5 Q6 Q7 Q8 Q9 Q10 Q11 Q13 Q14 Q15 Q18 Q19 Q20 Q21 Q22 Q23 Q34 Q35 Q36 Q37 Q38 Q39 Q40 Q41 Q42 Q43 Q46 Q47 Q48 Q49 Q51 Q54 Q55 Q56 Q57 Q58 Q61 Q62 Q65 Q66 Q67 Q68 Q69 Q70