A 100 ohm resistor and an unknown resistor are connected in series to a 10 volt battery if the potential drop across the 100 ohm resistor is 4 volts the resistance of the unknown resistor is answer

probably not the "magnets"in the magnet, so to speak, are thought to be electrons orbiting in shells. vurrent loops two sides to the loop

myth. it was once thought that animals, including cats and dogs, could only see in black and white. however, scientists have proven this to be a myth. in all animals, including humans, the perception of colour is determined by the presence of cells in the eye called cone photoreceptors.

3. dark matter

empty space could also be a simple vacuum