Vector b~ has x, y, and z components of 8.7,
1.4, and 6.5 units, respectively.
calculate the magnitude of b~ .

The magnitude of B is

Explanation:

we know that

The magnitude of Vector B is

where

x,y and z are the components of vector B

we have

substitute

answer: option c. i.e. electric current flowing “downhill” from the negative electrode to the positive electrode in a battery

explanation:

the water analogy to the circuits define the pipes (water flows) to the electric current. now, we know that the electric current flows from the positive terminal to the circuit (as shown in the diagram attached).

hence, option c is the correct answer.

it becomes positively charged by charging it