Section I - Multiple Choice (2 Viewers)

cookeemonstah

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radial magnetic field ensures a direct relationship. If it wast radial, then torque would keep changing as it turns.
 

nucgaek

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you find the length of wire and then use F=BILsin 30 to find the I :)
theta is the angle between the conductor and the flux lines, not the cross section of field lines so theta = 90
 

Zeroes

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Re: General Thoughts: Physics

and lol the meissner effect one didn't have any correct answers cos of poor wording hahaha
Omg this! I immediately crossed out the correct one when I saw "some" field lines or whatever it said, then picked the one about currents (B I think?) cause I didn't realise it said currents in magnets. :|
 

oh well

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no no , you find the length of the conductor using Sin Ratio i.e. l= 0.2 / sin30

then you sub it in F=BIlsin 30

how is the angle 90? :p
 

nicholash747

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no no , you find the length of the conductor using Sin Ratio i.e. l= 0.2 / sin30

then you sub it in F=BIlsin 30

how is the angle 90? :p
Because the wire is PERPENDICULAR to the magnetic field.
 

nmdsntfi

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sin30=0.2/l
l=0.2/sin30 = 0.4

0.03 = 0.05 x 0.4 x I x sin90
I = 0.03/(0.05 x 0.4)
= 1.5
?
 

himynameisbrody

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1. D
2.A
3. C
4. C
5. C
6. C
7. B
8. A
9. B
10. D
11. A
12. A
13. B
14. D
15. B
16. A
17. B
18. C
19. D
20. B

Not 100% sure on some
 

v1

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20.A
calculate energy of photon. using around 10*10^-6m as wavelength. convert to ev get around 0.1eV which isnt enough energy to overcome the band gaps except for A
 

hscwav2012

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Re: General Thoughts: Physics

what was 2 -was it the krypton or speed of light ?
 

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