Chứng tỏ rằng các trường véc tơ sau là trường thế và tính Z C
F · dR theo
đường cong trơn từng khúc nào đó nối A(10, −1), B(0, −1, 1).
a. F(x, y, z) = hsin z, −z sin yx cos z + cos yi
b. F(x, y, z) = h3x
2
y
2
z, 2x
3
yz, x3
y
2 − e
−z
i

the answer is ampere

the ampere is used to measure electricity. an ampere is a unit of electric current equal. a unit of measure for the flow of current in a circuit. one ampere is the amount of current flow provided when one volt of electrical pressure is applied against one ohm of resistance.

there are no contact forces mentioned on the list of choices that you've provided.

answer: 31, 5556. 952 seconds

b

explanation: