KCET 2018 Physics Solved Paper

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Question : 4 of 60

Marks: +1, -0

The correct Biot- Savart law in vector form is

d
→
B
=‌
µ0
4π
‌
I(d
→
l
×
→
r
)
r2
d
→
B
=‌
µ0
4π
‌
I(d
→
l
×
→
r
)
r3
d
→
B
=‌
µ0
4π
‌
Id
→
l
r2
d
→
B
=‌
µ0
4π
⋅‌
Id
→
l
r3

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