Gazala makes the device shown in the diagram and uses it to pick up four paper clips on the point of the nail. what would enable gazala to pick up eight paper clips? a) reversing the battery b) reversing the nail and using the nails head c) wrapping the wire around the nail more times d) unwrapping several loops of the wire from the nail.

The answer is C, wrapping the wire around the nail more times

Explanation:

The more a wire is wrap around the nail, the more electromagnet field becomes stronger, so long as  there is more wire unwound, so that the battery can be attached.

For Gazala to be able to pick up four clips at the tip of the wall, Gazala has to wrap the wire around the nail more often that it was done or wrapped before. This is true, because the electromagnet having an attractive force is directly proportional to the magnetic field square that is generated by a current running through the coiled wire.

The magnetic field as stated already, is directly proportional to the number of the wire turns around the magnetic element, it is important to increase the number of turns of the wire, so that electromagnet strength would be greater

think its the third option

real, smaller and upside-down.   so the answer should be b.