A calculator draws a current of 0.0008 A for 8 min. How much charge flows through it?

The charge that flow through the calculator is 0.384 C

Explanation:

Given;

current drawn by the calculator, I = 0.0008 A

time of current flow, t = 8 min = 8min x 60s = 480 s

The charge that flow through the calculator is given;

q = It

where;

q is the charge that flow through the calculator

I is the current drawn

t is the time

q = 0.0008 x 480

q = 0.384 Coulombs

Therefore, the charge that flow through the calculator is 0.384 C

the answer is the first electromagnet (a). this is because it has more coils around the ferromagnetic material. increasing the number of coils increases the surface area in which the metal interacts with the current in the coil. this enables more atoms in the metal to become aligned hence becoming more magnetized.