If an electromagnet is made using a battery circuit and a steel nail, how can its magnetic strength increase? 1-wrap more coils of wire around the nail 2-use a longer nail 3-remove the plastic insulation from the wire coil 4-replace the nail with a copper rod

1-wrap more coils of wire around the nail

Explanation:I took the test:) Hope

this helps!

3 1/4 %

explanation:

the best answer is d because the strong cohesion is caused by the ability of water molecules to undergo hydrogen bonding.

a is incorrect because when water solidifies, it becomes   ice, which expands and occupies a bigger volume for the same mass of water in its liquid state.

b is incorrect because water has high surface tension. besides bonding to itself it hydrogen bonds to other molecules at the top decreasing possibility for breaking of attractive forces.

c is incorrect because the water molecule has oxygen which is highly electronegative and so pulls the electron pair towards itself creating a dipole moment, making the molecule polar.

e is incorrect because water has strong adhesion, ability to stick to other molecules such as glass because of this molecules having stronger hydrogen bonding than water.