A wire carrying current `I` has the shape as shown in the adjoining figure. Linear parts of the wire are very long and parallel to X-axis while semicicular portion of radius `R` is lying in `Y-Z` plane. Magnetic field at point `O` is

Question:

Options :

(a) B=-μo/4π I/R (μî × 2k)
(b) B=-μo/4π I/R (πî + 2k)
(c) B=μo/4π I/R (πî - 2k)
(d) B=μo/4π I/R (πî + 2k)

Answer :

(b) B=-μo/4π I/R (πî + 2k)

Answer Steps :

step 1:

step 2:

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Four particles each of mass m are placed at the corners of a square of side length l. The radius of gyration of the system about an axis perpendicular to the square and passing through its centre is [EAMCET (Med.) 2000]

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