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# What is the resting membrane potential of nerve fibre?

$\begin {array} {1 1} (1)\;+\: 75\: mV & \quad (2)\;+\: 45\: mV \\ (3)\;-\: 70\: mV & \quad (4)\;-\: 45\: mV \end {array}$

(3) - 70 mV