How much positive charge is contained in 3 moles of argon? NA=6.022×10^23mol^−1, e=1.60×10^−19C.

1mole of Argon contains 6.022x10^23atoms

3moles will contain

3x6.022x10^23atoms

1 atoms of Argon contains 18electrons

3x6.022x10^23atoms will contain...

3x6.022x10^23 x 18electrons

= 3.252x10^25electrons

Note:In a Neutral Argon... No of Electrons and Protons(positive charge) are the same

From Charge Quantization Principle

Q=ne

n=3.252x10^25protons

e=1.6x10^-19C

Q=3.252x10^25 x 1.6x10^-19

Q=5.2x10^6C

force is mass*acceleration.

we have a very small mass: 11.4*0.001 kg

if we want 0.035n of force, we need an acceleration:

0.035 = 11.4*0.001*a

a = 0.035/(11.4*0.001) m/s^2

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.