# Math Help - [Electric Power] Solenoid, finding Flux

1. ## [Electric Power] Solenoid, finding Flux

The answer says it's 0 but I don't understand which direction is the magnetic field.

2. ## Re: [Electric Power] Solenoid, finding Flux

Use the Equations:
1) Magnetic Flux= Area of Loops x B x ( Magnetic Field).
2) Magnetic Flux= Area Loops x B x cos $(\theta)$

Since the magnetic field is perpendicular to the plane of loops, no a, so use equation 1 *Dont forget to convert $cm^2 to m^2$

$(\frac{8 * 10}{10,000}) (5 X 10^-2)$

MF = 0.0004 volts/sec