...

From the magnitude of your answer relative to the pixel size you will learn whether the effect of the Earth's field is negligible, minor, or something that must be actively compensated. By the way, computer monitors have much smaller pixels, e.g. 0.2 mm, to allow clear display of text.

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... figure.

In actuality, the op-amp $V_{\text{ground}}$ is slightly ambiguous until some sort of feedback is established. Another one of the op-amp's undrawn inputs can be used to adjust that value to agree exactly with some other reference voltage. This would allow, for example, adjusting the output voltage of your 101$\times$ amplifier to zero when the amplifier input voltage is zero.

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... all.

The frequency at which a significant decline in $G$ sets in is different for different models of op-amp. However, there are always engineering trade-offs, and better high frequency response is not always the sole desideratum; in some cases it is actually undesirable.

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....

In contrast to all the previous real-world modifications to ideal behavior explored in this quiz, modern designs have made this one pretty irrelevant. In particular, your op-amp has $R_{\text{in}}\sim 10^{12}\Omega$.

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... 21

Following long established tradition, we escape to the realm of Fantasy & Science Fiction to elucidate issues in Special Relativity.

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... frame.

In Bevis' rest frame, Merlin and the ground itself approach Bevis at speed $v'$ where
$v'=(c^2/v)\{1-[1-(v/c)^2]^{1/2}\}$.

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