# Getting E-Field from magnetic field intensity, H

## Homework Statement

Given the magnetic field intensity, H, find E.
H=$$\hat{y}$$6cos(2z)sin((2x10^7)t - 0.1x)

## Homework Equations

$$\nabla$$ $$\times$$ E = $$\frac{- \partial B}{\partial t}$$

## The Attempt at a Solution

Since we have H, we can use the relationship that $$\mu$$H = B and then take the partial derivative of that with respect to time. That would give us this quantity...

$$\frac{- \partial B}{\partial t}$$

Now, how do I get to E-field from that? How do you "uncurl" that?