AP EAMCET · PHYSICS · Magnetic Effects of Current
If a straight current carrying wire of linear density \(0.12 \mathrm{~kg} \mathrm{~m}^{-1}\) is suspended in mid air by a uniform horizontal magnetic field of 0.5 T normal to the length of the wire, then the current through the wire is
(Acceleration due to gravity \(=10 \mathrm{~m} \mathrm{~s}^{-2}\); Neglect earth's magnetic field)
- A 2.4 A
- B 1.2 A
- C 0.6 A
- D 4.8 A
Answer & Solution
Correct Answer
(A) 2.4 A
Step-by-step Solution
Detailed explanation
\(I B = \lambda g\) \(I = \frac{\lambda g}{B}\) \(I = \frac{(0.12 \mathrm{~kg} \mathrm{~m}^{-1})(10 \mathrm{~m} \mathrm{~s}^{-2})}{0.5 \mathrm{~T}}\) \(I = 2.4 \mathrm{~A}\)
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