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Questions 15–17 all refer to the below circuit diagram.If both switches $S_{1}$ and $S_{2}$ are left in the unconnected positions, whatis the current through the resistor labeled $R$ ?(A) 0(B) $\frac{15\left(V_{1}+V_{2}\right)}{68 R}$(C) $\frac{15\left(V_{1}+V_{2}\right)}{103 R}$(D) $\frac{15\left(V_{2}-V_{1}\right)}{68 R}$

A

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Chapter 1

Practice Test 1

Section 1

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in this problem in the circuit, both of the switch are left unconnected. So here we can see that this switch is not connected to here or this which is not connected to here. So if we try to see a current path from, let us say walter source, we even then can't flows from here go to year and the circuit blocks at this position where is to is to be connected to point B. Similarly, if we go from battery, we too, the current will stop here at point A. Because it is not connected to switch as well, so we cannot complete a circuit in any way. If both the switch are left unconnected, this means that there will be no current flowing in the circuit and hence the current I uh the grand flowing through the sister are will be simply zero and Pierre. So the answer is zero. This completes the solution. Thank you.

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