9702_w02_qp_2

[XPFMember]

Assalamoalaikum!!
Can anyone plz explain Q:9 b how to calculate the resistance.
Jazak Allah Khair

 

[beacon_of_light]

Use the formula,

R = $ L /A ($ is resistivity here )

since A and $ is constant ...

So
R1 / L1 = R2 /L2

or

change in R / R = change in L / L

change in R / 0.03 = 0.37 / 1800

AND U get your ans

 

[anzaar]

the solution @Beacon of light solved will give you full credit. nice way to solve.