At a distance of 10 cm from a long straight wire carrying current, the magnetic field is 0.04 T. At the distance of 40 cm, the magnetic field will be ______ .

At a distance of 10 cm from a long straight wire carrying current, the

1.	At a distance of 10 cm from a long straight wire carrying current, the magnetic field is 0.04 T. At the distance of 40 cm, the magnetic field will be ______ .
Answer» 0.01 T 0.02 T 0.08 T 0.16 T Solution :`y_(1)=10cm,y_(2)=40cm,B_(1)=0.04T` For long CURRENT carrying wire, `B=(mu_(0)I)/(2PI)rArrBprop1/y` (For constant I) `thereforeB_(1)/B_(2)=y_(2)/y_(1)rArrB_(2)=B_(1)xxy_(2)/y_(1)` `thereforeB_(2)=(0.04xx10)/40=0.01T`

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At a distance of 10 cm from a long straight wire carrying current, the magnetic field is 0.04 T. At the distance of 40 cm, the magnetic field will be ______ .

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