A) 0.75
B) 0.125
C) 0.25
D) 0.5
Correct Answer: B
Solution :
\[B\propto \frac{1}{{{r}^{3}}}\] Hence, \[\frac{{{B}_{2}}}{{{B}_{1}}}={{\left( \frac{{{r}_{1}}}{{{r}_{2}}} \right)}^{3}}\] \[{{B}_{2}}={{\left( \frac{{{r}_{1}}}{{{r}_{2}}} \right)}^{3}}\times {{B}_{1}}={{\left( \frac{1}{2} \right)}^{3}}\times 1\] \[=0.125\,\text{oersted}\]You need to login to perform this action.
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