One suggestion for as solutton to paper use is

Try not to waste it.

to use both sides and not waste it

i believe that dan is so anxious because he dose not know what awaits him when he gets there. but i dont know to be honest

the direction of the magnetic field produced by an electric current will change when the direction of the electric current changes. for example : if a current is flowing in a straight length of wire, the magnetic field is described by a concentric circle (using right-hand rule).