A) I and A increase.
B) I decreases and A increases.
C) I increases and A decreases.
D) both I and A decrease.
Correct Answer: B
Solution :
| Option [b] is correct. |
| Explanation: As we know that, |
| \[\operatorname{L}={{\mu }_{r}}{{\mu }_{0}}\frac{{{\operatorname{N}}^{2}}A}{l}\] |
| As L is constant for a coil, |
| \[\operatorname{L}=\propto \] A and L\[\propto -\] |
| As \[{{\mu }_{r}}\] and N are constant here so, to increase L for a coil, area A must be increased and l must be decreased. So answer [b] is correct. |
| Impotant Point: The self and mutual inductance of capacitance and resistance depend on the geometry of the devices as well as permittivity/ permeability of the medium. |
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