Question

Длину проводника увеличили в два раза. Как изменится значение напряжения при неизменной силе тока?А) увеличится в два разаБ) уменьшится в два разаВ) увеличится в четыре разаГ) уменьшится в четыре раза.

Answer 1

R=p*L/S

U1=I*R1=I*p*L/S

U2=I*R2=I*p*2*L/S

U2/U1=(I*p*2*L/S) / (I*p*L/S) =2 Раза

А) увеличится в два раза

Answer 2

The answer is Б) уменьшится в два раза. Here is a detailed explanation:

The voltage across a conductor is proportional to its resistance, according to Ohm's law: V = IR, where V is the voltage, I is the current, and R is the resistance. The resistance of a conductor depends on its length, cross-sectional area, and resistivity, according to this formula: R = ρL/A, where ρ is the resistivity, L is the length, and A is the cross-sectional area.

If the length of the conductor is doubled, while the current and the cross-sectional area remain constant, then the resistance will also double, according to the formula. This means that the voltage will also double, according to Ohm's law.

Therefore, if the length of the conductor is doubled, the voltage will increase by a factor of two. The answer is Б) уменьшится в два раза.