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Magnetism and Magnetic Effects of Electric Current — Physics STD 12 — Question

Tamilnadu BoardEnglish MediumSTD 12PhysicsMagnetism and Magnetic Effects of Electric Current1 Mark
MCQ
A circular loop has radius $R$ and a current I flows through it. Another circular loop has a radius of $2 R$ and a current 21 flows through it. The ratio of the magnetic fields at their centres is-
  • A
    $\frac{1}{4}$
  • ✓
    1
  • C
    2
  • D
    4
✓

Answer

Correct option: B.
1
1
Hint:$B _1=\frac{\mu_0 I}{2 r} \text { and } B _2=\frac{\mu(2 I)}{2(2 R)} ; \frac{B_1}{B_2}=1$

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