1) Find the resistance of 1000m of copper wire 25 sq mm in cross- section The resistance - Science - Electricity

Question

1) Find the resistance of 1000m of copper wire 25 sq mm in cross-
section The resistance of copper is 1/58 ohm per meter length and 1
sq mm cross - section
2) A battery has an emf of 12 8 V and supplies a current of 3 2A
What is the resistance of the circuit How many Coulomb charge leave
the battery in 5 minute ?
3) Two coils connected in series have a resistance of 18 ohm and
when connected in parallel have a resistance of 4 ohm Find the
value of individuals resistance of the coils
4) A current of 0 5 a is drawn by a filament of an electric bulb
from 10 minutes Find the amount of electric charge that flows
through the circuit
IT'S URGENT

Akansha Tyagi · Accepted Answer

Kindly post different question in different thread
2  V=IRR=12 83 2=4ohmi=qt⇒q=3 2×5×60=960C3
 R+R'=18 
   (1)RR'R+R'=4RR'=72,    (R-R')2=(R+R')2-4RR'(R-R')2=182-4×72=36R-R'=6 
  (2)ON Solving (1) and (2),R=12,  R'=6ohm