## Using The following input waveform, sketch the corresponding output waveform for each op amp circuit (a through d). Assume ideal op amp behavior.

EXPERT ANSWER

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# Physics

## An MRI machine needs to detect signals that oscillate at very high frequencies. It does so with an LC circuit containing a 15mH coil. To what value should the capacitance be set to detect a 450 MHz signal?

## What is the potential difference across a 12.0 mH inductor if the current through the inductor drops from 140 mA to 60.0 mA in 14.0 μs ?

EXPERT ANSWER w = 1/sqrt(LC) LC = 1/w^2 C = 1/(L*w^2) where w= 2*pi*f = 900*pi*10^6 rad/s C = 8.339 * 10^-18 F

EXPERT ANSWER emf is given by E = L di/ dt = 0.012* (140 – 60)* 10^-3 / (14* 10^-6) E = 68.57 V ======= option (a) is correct