When a $12\, V$ battery is connected across an unknown resistor,there is a current of $2.5\, mA$ in the circuit. Find the value of the resistance of the resistor.
- A$4.8 \,\Omega$
- B$4.8 \,k\Omega$
- C$2.4 \,k\Omega$
- D$1.2 \,\Omega$
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