MCQOPTIONS
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MCQOPTIONS
| 1. |
The current density varies with radial distance r as\[j=a{{r}^{2}}\], in a cylindrical wire of radius R. The current passing through the wire between radial distance R/3 and R/2 is |
| A. | \[\frac{65\pi a{{R}^{4}}}{2592}\] |
| B. | \[\frac{25\pi a{{R}^{4}}}{72}\] |
| C. | \[\frac{65\pi {{a}^{2}}{{R}^{3}}}{2938}\] |
| D. | \[\frac{81\pi {{a}^{2}}{{R}^{4}}}{144}\] |
| Answer» B. \[\frac{25\pi a{{R}^{4}}}{72}\] | |