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Physics P1 - Last 3 Days Discussion

D

Daniyal23

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34. Two copper wires X and Y have the same volume. Wire Y is four times as long as wire X.

What is the ratio
resistance of wire X
____________
resistance of wire Y
?
A 4, B 8, C 16, D 64

Ans is C
How did they find the answer?
 
Prawesh Dahal

Prawesh Dahal

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Daniyal23 said:
34. Two copper wires X and Y have the same volume. Wire Y is four times as long as wire X.

What is the ratio
resistance of wire X
____________
resistance of wire Y
?
A 4, B 8, C 16, D 64

Ans is C
How did they find the answer?
Click to expand...

Well, im supposing & as resisitivity
so R= & L/A but theres another formula for R in volume case...if u multiply the numerator and denominator by L. u get

R = & L x L / A x L ----> ( A x L ) is volume.
So, R is also,
= & L^2/ V ! Use this and u will get the ans. You can already predict, 4L gets squared and u get 16 as the ratio.
 
ICTloverz

ICTloverz

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How to calculate the vertical component when you're provided with horizontal component and an angle.
 
M

Mattman

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Potential energy is gained, so

PE=Work lost(charge is moving away from electric field)
PE=Forcexdistance moved in that direction
 
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