Electromagnetic Induction and a coil of wire

[calculator20]

The magnetic field that is oriented perpendicularly through a 9.2 cm diameter coil of wire drops from 6.4 T to 6.1 T in 0.076 seconds. What is the emf induced in the coil?

Trying to answer this. My question is, if they are perpendicular then does that mean that cos90 makes phi = BAcos theta become zero therefore making the emf zero when put into emf = -N delta phi/delta t ? That doesn't seem right?

 

[ehild]

The magnetic field that is oriented perpendicularly through a 9.2 cm diameter coil of wire drops from 6.4 T to 6.1 T in 0.076 seconds. What is the emf induced in the coil?

Trying to answer this. My question is, if they are perpendicular then does that mean that cos90 makes phi = BAcos theta become zero therefore making the emf zero when put into emf = -N delta phi/delta t ? That doesn't seem right?

The magnetic field is perpendicular to A, the cross section of the coil. Theta means the angle between the normal of A and the magnetic field.

 

[rude man]

The magnetic field that is oriented perpendicularly through a 9.2 cm diameter coil of wire drops from 6.4 T to 6.1 T in 0.076 seconds. What is the emf induced in the coil?

Trying to answer this. My question is, if they are perpendicular then does that mean that cos90 makes phi = BAcos theta become zero therefore making the emf zero when put into emf = -N delta phi/delta t ? That doesn't seem right?

How many turns in the coil?