# NEET Questions Solved

A coil has an inductance of 2.5 H and a resistance of 0.5 r. If the coil is suddenly connected across a 6.0 volt battery, then the time required for the current to rise 0.63 of its final value is

(1) 3.5 sec

(2) 4.0 sec

(3) 4.5 sec

(4) 5.0 sec

(4) $t=\tau =\frac{L}{R}=\frac{2.5}{0.5}=5\text{\hspace{0.17em}}\mathrm{sec}$

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