contestada

A metal wire of length 1cm and of uniform diameter has a resistance of 0.8 ohms. What is the resistance of a 50cm wire coil made of the same material but having twice its diameter?
​

Respuesta :

dragon1524

Answer:

20

Explanation:

R= resistance  P = resistivity  

L = length  A = area

0.8 = 1cm/A

R = J l/A       => 0.8* 50*A/A

                   => 0.8 * 25

                   => 20

susmitat989

Answer:

Resistance is directly proportional to length, inversely proportional to cross-sectional area. Pay attention in class, and observe that even easy multiple choice questions can have only wrong answers if the setter makes a mistake.

Otras preguntas