A wire `KMN` moves along the bisector of the angle `theta` with a constant velocity `v` in a uniform magnetic field `B` perpendicular to the plane of the paper and directed inward. Which of the following is correct?
A. Effective length of the wire is `2L "sin" theta/2`
B. `E.m.f` induced between `K` and `N` is `2BLV "sin"(theta)/(2)`
C. The shape of `KMN` is immaterial, only the end points `K N` are important.
D. All the above
