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30.8 Energy Density of a Magnetic Field Two horizontal parallel wires are separated by a distance

`d`

. If they each carry a current of

`I`

in opposite directions, what expression gives the energy density of the magnetic field a distance

`d`

above the top wire?

```
u_(B)=(9\mu _(0)I^(2))/(32\pi ^(2)d^(2))
u_(B)=(\mu _(0)I^(2))/(32\pi ^(2)d^(2))
u_(B)=(8\mu _(0)I^(2))/(9\pi ^(2)d^(2))
u_(B)=0
u_(B)=(\mu _(0)I^(2))/(16\pi ^(2)d^(2))
```