If coil is open then L and R become

Options

A. `oo,0`
B. `0,oo`
C. `oo,oo`
D. `0,0`

Answer

B

Explanation

When coil is open, there is no current in it, hence no flux is associated with it, ie, `phi=0`
Also, we know that flux linked with the coil is directly proportional to the current in the coil. Ie, `phi alpha I`
`or phi=Li`
Where L is proportionally constant known as self-inductance.
`therefore L=(phi)/(i)=0`
Again since `i=0,"hence" R=oo`