passion89
Member
Yup 8 is A even went to check it later with the teacher and textbook.Mumma said:8.A - because maximum FLUX goes through the loop when its perpendicular to field
Yup 8 is A even went to check it later with the teacher and textbook.Mumma said:8.A - because maximum FLUX goes through the loop when its perpendicular to field
I got exactly the same except for 10, which i put Azeek said:Luckily i wrote mine down on the question sheet aswell
This is what i got:
1. C [the values of g changes due to lithosphere density etc.]
2. B [A mass in circular motion experiences tangential velocity]
3. D
4. B [Acceleration on a projectile is constant at 9.8m/s2]
5. D [Using Keppler's formula]
6. A
7. C [Using formula]
8. A [Maximum flux is experienced when it is perpindicular to the field]
9. D [The generator doesn't have a split ring commutator so its not B and D, motor effect applies so its not A]
10. C [Using the ratio of voltages to coil turns]
11. A
12. C
13. D
14. C [Using the formula]
15. A
Even if you apply the formula for EMF on this generator and then graph it you should get a sinusoidal pattern because there is nothing in that diagram to tell me that the current is being reversed every half turn.ianc said:Also, even though I put D for 9 im not sure if its right....
But the plates changed from aluminium to copper. Isn't that a problem?shinji said:for 14 i just used logic. lol
if u wanan double electric field strength, why would u wanna double the distance?
sooo hence, double the voltage
no because it goes what new arrangement can be used ... the only two that would have been correct was perpex and copper... but perpex doesnt conduct electricity so i cant see how that worksXcarvengerX said:But the plates changed from aluminium to copper. Isn't that a problem?
How do you know whether we're right or wrong?Riviet said:Looking at all your answers, I can conclude that I got about 12-13/15 (minimum)
Yes you are totally right. that is what i did and it is D. the 45 deg tricks u. i was getting anoyed that every1 in this forum were saying C. it is sin90!! so it's D!vnblueberry said:the top people in my school said
Q 7)
the magnetic field is ALREADY perpendicular to the current carrying wire (ie: the B field is going into page, perpendicular to wire) hence, theda is always 90
so to say, that that 45 degree is useless and used to trick everyone.
please, post your comment. because i put C and i hope its C
but i think it is D :rofl:
lol if it is, everyone that posted their MC answers got atleast one wrong
edit:
except that guy below
V
i think some are electron flow and some are conventional current.Gecko888 said:Question 9:
google 'Faraday disk dynamo'
you will get contradictory results! I think the Nasa site says B, one of the physics sites says C.
Otherwise my answers are exactly the same as pianpudodoel's.