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Grade 10Magnetism

a straight wire of diametter 0.5mm carrying a current of 1amp is replaced by another wire of 1mm diamere carrying the same current.the strength of the magnetic field far away is
1.twice the earlier value
2.one half of the earlier value
3.one quater of the earlier value
4.same as the earlier value
plz. give ur ans along with the reason.......

Profile image of Navjyot Kalra
12 Years agoGrade 10
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1 Answer

Profile image of ROSHAN MUJEEB
6 Years ago
option 4) magnetic field at distance far away remains same even if diameter is changed as formula is B=u0i/2pi*r. here r remains same and i remains same in both cases hence field is unchanged

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