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JIPMER 2004
Exam
JIPMER
Year
2004
Subject
Physics
Chapter
Magnetic Effects of Current

JIPMER 2004 · Physics · Magnetic Effects of Current

20 ampere current is flowing in a long straight wire. The intensity...

2020 ampere current is flowing in a long straight wire. The intensity of magnetic field at a distance 1010 cm from the wire will be

Options

  1. A2×10−5 Wb/m22 \times 10^{-5} \mathrm{~Wb} / \mathrm{m}^2
  2. B9×10−5 W/m29 \times 10^{-5} \mathrm{~W} / \mathrm{m}^2
  3. C4×10−5 Wb/m24 \times 10^{-5} \mathrm{~Wb} / \mathrm{m}^2
  4. D6×10−5 Wb/m26 \times 10^{-5} \mathrm{~Wb} / \mathrm{m}^2

Correct answer

C. 4×10−5 Wb/m24 \times 10^{-5} \mathrm{~Wb} / \mathrm{m}^2

Step-by-step solution

Here: i=20 A,r=10 cm=0.1 mi=20 \mathrm{~A}, r=10 \mathrm{~cm}=0.1 \mathrm{~m} Intensity of magnetic field produced due to straight current carrying wire is B=μ04π×2irB=\frac{\mu_0}{4 \pi} \times \frac{2 i}{r}=10−7×2×200.1=4×10−5 Wb/m2\begin{aligned} & =10^{-7} \times \frac{2 \times 20}{0.1} \\ & =4 \times 10^{-5} \mathrm{~Wb} / \mathrm{m}^2\end{aligned}$$
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