Which sentence contains a comma splice? a)flags usually represent nations, but they are also used to send messages. b)jack, the captain of the team, called a team meeting for saturday, september 12.c)although most people in the ancient world lived in plain houses, the palace at knossos had bathrooms. d)a storm front will move into north georgia on thursday, however it should be sunny and clear by the weekend.

It's D. The comma connects two independent clauses. Instead of a comma, a semicolon or period should separate the two independent clauses.

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).