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## Homework Statement

I have the strength of the magnetic field,

**B**, the time,

**Delta t,**a circle formed ring with the diameter,

**d**. I should calculate the induced tension, when the surface is

(a) parallel to the B field

(b) 50 degrees on the B field

Need help to solve it (symbolic if possible).

## Homework Equations

I thought of something like:

[tex] $U_H = A_H \frac{I B}{d}$ [/tex],

but I don't have "I". And there are no angles there. Please tell me how to solve it symbolic.

## The Attempt at a Solution

Please look the (2).