It would take more energy to reheat 12 cups because only 1 or 2 cups can fit in a microwave rather an than brewing 12 cups in a coffee pot.
We know




Most nearest value is 37000N/m^2
Hence option b is correct
Answer:
(Equation 10.3. 2): RS=R1+R2+R3+R4+R5=20Ω+20Ω+20Ω+20Ω+10Ω=90Ω
The root mean square of the current is given by

where

is the maximum value of the current.
In our problem, the maximum current allowed without breaking the filament is equal to

. Therefore, the largest root-mean-square current allowed without breaking the wire is