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Calculating resistance, voltage, and current using Ohm's law


A student builds a simple circuit with a single resistor with resistance 2, R and measures an electric potential difference delta, V across the resistor. Then, the student replaces the resistor with a new one of resistance start fraction, R, divided by, 2, end fraction and keeps the electric potential difference the same.
What is the current I, start subscript, 2, end subscript through the new circuit in terms of the original current, I, start subscript, 1, end subscript?
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