# Writing mesh equations for a RL circuit

1. Mar 17, 2017

### TheBlueDot

1. The problem statement, all variables and given/known data
Write the equations for the two mesh current i1 and i2. The circuit and the answer to mesh 1 are showing below

2. Relevant equations

3. The attempt at a solution
My answer came out to be the same as the answer key except for the -25di1/dt term. It seems that this term gets counted twice. Could someone please help me understand this problem? Thanks!!!

2. Mar 17, 2017

### Staff: Mentor

The mesh current $i_1$ passes through both inductors so it contributes two mutual inductance terms to the loop.

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