John Skroblszerwpaki- PHYs 202 (Sumner 2018) Test#1 . Summer2018 s the total equ

Question

John Skroblszerwpaki- PHYs 202 (Sumner 2018) Test#1 . Summer2018 s the total equivalent resistance Rios (in units of 12) between points A E, in the following circuit where, R,-40?, R2 = 45 ?, and R3 90 ?, The total equivalent resistance is: 15. AO 437 BO S11 O8 DO 70 EO 81.9 left Bout In the figure above, the direction of the Loreatz force on a positive particle with velocity v in the B-feld is 16. AO A. left BO B. up CO C. down DOD. in EOE out In the figure shown, a wire is oriented borizoatally across the screen with a current that is moving left The direction of the maguetic field B at point above the wire is . - 17.AO in BO left CO right DO down Tube A velocity selector is used in accelerator mass spectrometry to select particles based oaa on their speed. The velocity selector is composed of electric and magnetic felds, such that particles with the correct charge to mass ratio and speed will be unaf fected, and other particles will be deflected. Choose the correct statement regarding this velocity selector: ? (into paper) 18.AO slower moving positively charged particles will be deflected downwards. plates BO faster moving positively charged particles will be deflected downwards CO the E-Field and the B-Field must be in opposite directions. DO particles with lesser charge will be deflected downwards. EO particles with greater charge will be deflected downwards.

Explanation / Answer

15.

D)

R2 and R3 are in parallel and their combination is given as

R23 = R2 R3 /(R2 + R3)

R23 = 45 x 90/(45 + 90)

R23 = 30 ohm

R1 and R23 are in series and their combination is given as

R123 = R1 + R23

R123 = 40 + 30

R123 = 70 ohm

16.

using right hand rule , the direction of magnetic force comes out to be downward

C)

17

D)

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