A cell has an electromotive force (e.m.f.) of 8.0 V and negligible internal resistance. The cell forms part of a circuit, as shown.
The reading ${V_1}$ is 4.0 V and the reading ${V_1}$ is also 4.0 V.
What is the resistance of resistor R?
1 )
$0.50\Omega $
$2.0\Omega $
3 )
$4.0\Omega $
4 )
$8.0\Omega $
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