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Mathematics
Mathematics
Problem
Initially, a point
P
P
P
is
2
cm
2\,\text{cm}
2
cm
from a long straight wire carrying
3
A
3\,\text{A}
3
A
and the magnetic field there is
B
0
B_0
B
0
. Later, the current is increased to
6
A
6\,\text{A}
6
A
and the point is moved to a distance of
6
cm
6\,\text{cm}
6
cm
. What is the ratio
B
new
B
0
\dfrac{B_{\text{new}}}{B_0}
B
0
B
new
? a)
1
3
\dfrac{1}{3}
3
1
b)
3
2
\dfrac{3}{2}
2
3
c)
2
3
\dfrac{2}{3}
3
2
d)
2
9
\dfrac{2}{9}
9
2
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