Biology; Chemistry; Physics: Post your doubts here!

[Faizan Muhammmad]

Paper 1's ho gae sarey?

yep

 

[Muhammad_Hamza]

Ma ne sahi banaya?

 

[Faizan Muhammmad]

Ma ne sahi banaya?

the lights meet before not after the retina in short sighted

 

[asadalam]

yep

All?Kitna time laga?

 

[Muhammad_Hamza]

the lights meet before not after the retina in short sighted

Please edit...

 

[Faizan Muhammmad]

All?Kitna time laga?

only a some were left. baqee pahlay kiay huay thay
kal kiay hain sara din

 

[asadalam]

only a some were left. baqee pahlay kiay huay thay
kal kiay hain sara din

Aaj kia karo gay

 

[Faizan Muhammmad]

Please edit...

 

[Faizan Muhammmad]

Aaj kia karo gay

p2

 

[Muhammad_Hamza]

View attachment 42999

thanks..

 

[funky brat]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Physics (5054)/5054_w12_qp_11.pdf
Why is 35th B, not C. According to Lenz's law, when magnet moves inside the north pole is developed at the left hand side on the first coil, so in the second coil it would be south, no?

 

[Faizan Muhammmad]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Physics (5054)/5054_w12_qp_11.pdf
Why is 35th B, not C. According to Lenz's law, when magnet moves inside the north pole is developed at the left hand side on the first coil, so in the second coil it would be south, no?

that is right and that is what B says?

 

[FLRNAB]

Post the 1uestion again

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Physics (5054)/5054_s11_qp_12.pdf
Q3. Why isn't the resultant force C?

 

[FLRNAB]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Physics (5054)/5054_w12_qp_11.pdf
Why is 35th B, not C. According to Lenz's law, when magnet moves inside the north pole is developed at the left hand side on the first coil, so in the second coil it would be south, no?

Lenz Law says the coil will try to oppose the effect of the magnet. When magnet moves in it will repel it and when magnet moves out it will attract it.

 

[Uchiha-Sasuke]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Physics (5054)/5054_w12_qp_11.pdf
Why is 35th B, not C. According to Lenz's law, when magnet moves inside the north pole is developed at the left hand side on the first coil, so in the second coil it would be south, no?

Lenz's law: induced current flows in a direction such that it oposes its cause
No north on left stated ...
pole on coil always develops opposite pole of magnet what is brought close ... THAT is lenz's law ... magnet moves in: north on left to oppose(repel) .. magnet moves out : south on left to oppose(attract)

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Physics (5054)/5054_s11_qp_12.pdf
Q3. Why isn't the resultant force C?

they've clearly drawn that dot saying centre of circle turned by car: that's the centripetal force

 

[asadalam]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Physics (5054)/5054_s11_qp_12.pdf
Q3. Why isn't the resultant force C?

In qs like these,the object is moving in a circle at a constant speed,so due to centripetal force the resultant will always be towards the center of the circle.

 

[funky brat]

Lenz Law says the coil will try to oppose the effect of the magnet. When magnet moves in it will repel it and when magnet moves out it will attract it.

I know that. I think I checked the wrong answer.

 

[funky brat]

Raat ko 5 bajay so kar bhi uth gyi ho itni jaldi?!

I got up at 9:20 almost.

 

[Uchiha-Sasuke]

Q4 b) can somebody draw the diagram please ?
http://papers.xtremepapers.com/CIE/Cambridge International O Level/Physics (5054)/5054_w06_qp_2.pdf

 

[funky brat]

p2

Paper 2 ki tyari book se nahi karni?