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

Place several e-field sensors at a few points on different equipotential lines, and look at the relationship between the electric field and the equipotential lines. which statement is true? 1-at any point, the electric field is perpendicular to the equipotential line at that point, and it is directed toward lines of higher voltages. 2-at any point, the electric field is perpendicular to the equipotential line at that point, and it is directed toward lines of lower voltages. 3-at any point, the electric field is parallel to the equipotential line at that point.

Which of the following statement is false ? a.batteries should never be stored on metal trays or outside in the elements)b, battery acid cannot be neutralized)c.do not stack batteries on top of each other)d.never put a damaged battery in a dumpster. i

The direction of the current in an alternating current circuit remains constant. is direct. changes repeatedly. changes randomly.