magnetic fields

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5 Terms

1
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B

<p>B</p>
2
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C

find peak voltage (approx 9.9)

2 x peak voltage must fit (peak and trough) approx 19.8

19.8/8 = 2.47

must be higher than 2.47

<p>C</p><p>find peak voltage (approx 9.9)</p><p>2 x peak voltage must fit (peak and trough) approx 19.8</p><p>19.8/8 = 2.47</p><p>must be higher than 2.47</p>
3
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D

time difference = 0.6 divs

0.6 × 5 ×10^-3 = 3 ×10^-3

3x10^-3 / 40×10^-3 = 3/40

3/40 × 2pi = 3/20 pi = 0.15 pi

<p>D</p><p>time difference = 0.6 divs</p><p>0.6 × 5 ×10^-3 = 3 ×10^-3</p><p>3x10^-3 / 40×10^-3 = 3/40</p><p>3/40 × 2pi = 3/20 pi = 0.15 pi</p>
4
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A

<p>A</p>
5
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B

P = I² R

I rms = I/√2

P’ = (1/√2)² x 2 R = P

<p>B</p><p>P = I² R</p><p>I rms = I/<span><span>√2</span></span></p><p><span><span>P’ = (1/√2)² x 2 R = P</span></span></p>