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JEE Main 202127 JulyMorning Shift
Exam
JEE Main
Year
2021
Date
27 July
Shift
Morning Shift
Subject
Physics
Chapter
Magnetic Properties of Matter

JEE Main 2021 · 27 July · Morning Shift · Physics · Magnetic Properties of Matter

In a uniform magnetic field, the magnetic needle has a magnetic...

In a uniform magnetic field, the magnetic needle has a magnetic moment 9.85×10−2Am−29 . 85 \times {10}^{- 2}A{m}^{- 2} and moment of inertia 5×10−6kgm2.5 \times {10}^{- 6}kg{m}^{2} . If it performs 1010 complete oscillations in 55 seconds then the magnitude of the magnetic field is ____mTmT [Take π2{\pi}^{2} as \left9 . 85\right]

Correct answer

0

Step-by-step solution

T=2πIMBT = 2\pi\sqrt{\dfrac{I}{MB}}
B=80×10−4=8mTB = 80 \times {10}^{- 4} = 8mT
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