**Part A.**

Net current:

$\overline{){\mathbf{i}}{\mathbf{=}}{{\mathbf{i}}}_{{\mathbf{1}}}{\mathbf{+}}{{\mathbf{i}}}_{{\mathbf{2}}}{\mathbf{+}}{{\mathbf{i}}}_{{\mathbf{3}}}}$

Current:

$\overline{){\mathbf{i}}{\mathbf{=}}\frac{\mathbf{Q}}{\mathbf{t}}}$

Part A. Calculating current based on movement of charge

If Qr = -0.75 C of charge moves to the right in tr = 4.5 s while Qt = -3750 mC of charge moves to the left in tt = 5.0 s, what is the net current to the right?

Express your answer to the two significant figures and include the appropriate units.

Part B. Calculating the number of electrons due to the current

How many electrons move past a fixed reference point every t = 0.50 ps if the current is i = 0.3 uA?

Express your answer as an integer

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