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| 1. |
Only circular part of the wire shown in the figure has resistance `sigam` per unit length. The radii of the circles are `r` and `R` and `/_POQ=alpha` (in radian). If a potential difference `V_(P)-V_(Q)=V` is applied across the point `P` and `Q`, the magnetic field at point `O` is A. `(mu_(0))/(4pi)(V)/(sigma)[(2pi-alpha)/(r^(2))-(alpha)/(R^(2))]`B. `(mu_(0)V)/(4pi)[(alpha)/(r^(2))-(2pi-alpha)/(R^(2))]`C. `(mu_(0))/(4pi)(V)/(sigma)[(1)/(r^(2))-(1)/(R^(2))]`D. `(mu_(0))/(4pi)(sigma)/(V)[(1)/(r^(2))-(1)/(R^(2))]` |
| Answer» `i_(R )=(V)/(alphaRsigma)("cc"w)i_(r)=(V)/((2pi-alpha)rsigma)(cw)` | |