Which one of the following modifications may ncrease the sensitivity of moving coil galvanometer?
$1^{st}$ Way : By using spring of smaller torsion constant.
$2^{nd}$ Way : By using a smaller coil
$3^{rd}$ Way : By using a stronger magnet
$4^{th}$ Way : By using a coil having fewer number of turns.
Medium
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Sensitivity $=\frac{\mathrm{BNA}}{\mathrm{K}},$ by increasing $\mathrm{B}$ (stronger magnet) and decreasing torsion constant, $k$ (weaker springs)
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