Verified Solution • 2025–26 Session moderate

QJEEM21Phfd16: JEE Main 2021 Physics - Class 12 JEEM21Phfd16 Solution: Four identical long solenoids A, B, C and D are connected to…

Four identical long solenoids A, B, C and D are connected to each other as shown in the figure. If the magnetic field at the center of A is 3T, the field at the center of C would be : (Assume that the magnetic field is confined with in the volume of respective solenoid).

JEE Main 2021 (Online) 18th March Morning Shift Physics - Magnetic Effect of Current Question 118 English

Multiple Choice Options

  • A 12T
  • B 6T
  • C 9T
  • D 1T

Step-by-Step Verified Solution

JEE Main 2021 (Online) 18th March Morning Shift Physics - Magnetic Effect of Current Question 118 English Explanation
3I1=i3{I_1} = {i}

⇒\Rightarrow I1=i3{I_1} = {{{i}} \over 3}

B=μ0ni=3TB = {\mu _0}n{i} = 3T

BC=μ0nI1{B_C} = {\mu _0}n{I_1}

⇒\Rightarrow BC=μ0ni3=3T3=1T{B_C} = {\mu _0}n{{{i}} \over 3} = {{3T} \over 3} = 1T

Related Learning Resources & Exam Preparation

JEE Main PYQ Question Bank
Browse year-wise authentic previous years' questions with solutions
Authentic CBT Mock Tests
Simulate official exam environment with live timer and percentile scoring