Show that the RMS current in the 1 kW resistor is 6.5 mA. If the AC voltage source was replaced by a battery, what would the current in the resistor be

the answer is f1 and d2 because if you put equal force on those two points the beam would balance trust me on this

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.