# Homework Help: Electric and magnetic fields

1. Jan 24, 2004

### janrain

Does the following equation mean that electric field E and magnetic field B are always perpendicular??
the equation is:
Curl E = - (partial derivative of B with respect to t)
where E is time dependent too.

2. Jan 24, 2004

### nbo10

JMD

3. Jan 24, 2004

### janrain

right...thank you

4. Jan 24, 2004

### nbo10

$$\vec E \cdot \vec B = 0$$

say's E & B are 90 degrees to each other.

JMD