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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 is1.twice the earlier value2.one half of the earlier value3.one quater of the earlier value4.same as the earlier valueplz. give ur ans along with the reason.......

Navjyot Kalra , 10 Years ago
Grade 10
anser 1 Answers
ROSHAN MUJEEB

Last Activity: 4 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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