Why should you dress professionally and do some research beforehand?
a. you should dress professionally, but research is not needed.
b. dressing professionally and doing research you appear confident and competent.
c. you should research, but dress as usual to them learn who you really are. d. if you don’t do both of these, you will not even be interviewed.

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).

which sentence refers to a dynamic character?

b.

a man learns empathy after working with those he formerly judged.

hope this answers your question!