Pl me solve the first and second

(1)

we know that

potential will be added when cells are connected in series

so, the polarity must be same

positive of one cell must be connected to negative of another cell

we can see only one option

option-(i)......Answer

(2)

(A)

we know that

so, smaller value of I means larger value of R

so,

option-3.....Answer

(B)

we know that

maximum resistances can be obtained when resistors are connected in series

so,

so, option-4........Answer

(C)

we know that series combination

we add resistances

so, we will get largest value of equivalent resistance

so, option-2..........Answer

x = ± 6i

step-by-step explanation:

x^2 = -36

take the square root of each side

sqrt(x^2) = sqrt(-36)

we know sqrt(ab) = sqrt(a) sqrt(b)

x = ±sqrt(36) sqrt(-1)

we know that sqrt (-1) = i

x = ± 6i

reduce the friction between its moving parts

step-by-step explanation:

in fact, by reducing the friction between the moving parts of the machine, it is possible to reduce the energy wasted due to this friction; therefore, more input energy is converted into useful work, and this will improve the efficiency of the machine.