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

Answer»

`(mu_(0))/(4pi)(V)/(SIGMA)[(2pi-ALPHA)/(r^(2))-(alpha)/(R^(2))]`
`(mu_(0)V)/(4pi)[(alpha)/(r^(2))-(2pi-alpha)/(R^(2))]`
`(mu_(0))/(4pi)(V)/(sigma)[(1)/(r^(2))-(1)/(R^(2))]`
`(mu_(0))/(4pi)(sigma)/(V)[(1)/(r^(2))-(1)/(R^(2))]`

Solution :`i_(R )=(V)/(alphaRsigma)("CC"w)i_(r)=(V)/((2pi-alpha)rsigma)(CW)`


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