Saved Bookmarks
| 1. |
Consider a long cylindrical wire carrying current along the axis of wire. The current distributed non-uniformly on cross section. The magnetic field B inside the wire varies with distance `r` from the axis as `B=kr^(4)` where k is a cosntant. The current density `J` varies with distance `r` as `J=cr^(n)` then the value of `n` is (where c is another constant). |
|
Answer» Correct Answer - 3 `int bar(B).bar(dl)=u_(0)i_("ene")` `implies B(2pir)=mu_(0)int_(0)^(R) 2pirdr=mu_(0)int_(0)^(r)2piCr^(n-1)dr` `kr^(4)xx2pir=mu_(0)2piC (r^(n+2))/(n+2)impliesn+2=5impliesn=3` |
|