TS EAMCET · Physics · Magnetic Effects of Current
A long straight wire carrying a current of \(30 \mathrm{~A}\) is placed in an external uniform magnetic field of induction \(4 \times 10^{-4} \mathrm{~T}\). The magnetic field is acting parallel to the direction of current. The magnitude of the resultant magnetic induction in tesla at a point \(2.0 \mathrm{~cm}\) away from the wire is \(\left(\mu_0=4 \pi \times 10^{-7} \mathrm{H} / \mathrm{m}\right)\)
- A (a) \(10^{-4}\)
- B \(3 \times 10^{-4}\)
- C \(5 \times 10^{-4}\)
- D \(6 \times 10^{-4}\)
Answer & Solution
Correct Answer
(C) \(5 \times 10^{-4}\)
Step-by-step Solution
Detailed explanation
\(i=30 \mathrm{~A}, B=4 \times 10^{-4} \mathrm{~T}\) \(r=2 \mathrm{~cm}=2 \times 10^{-2} \mathrm{~m}\) Initial magnetic field (parallel to the wire), \(B_1=4 \times 10^{-4} \mathrm{~T}\) Magnetic field produced by the straight wire,…
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