4,5,6,7 please and thank you so much for your help

4. A rectangular copper loop is placed in a magnetic field of strength 0.55 T, as shown below. 15 cm 18 cm 24 cm - 26 cm a) Calculate the magnetic flux for the loop. 2 marks b) The magnetic field is suddenly shut off. In which direction will current be temporarily induced in the loop when this happens? Check one below. I mark O clockwise counterclockwise c) If it takes 0.13 s for the magnetic field to be shut off, what is the average EMF induced in the loop? 5. A circular coil of wire, of 20 turns and radius 0.15 m, is rotating uniformly at 10.0 Hz about an axis in the plane of the coil and perpendicular to a uniform field of 0.30 T. a) Determine the magnetic flux when the plane of the coil is at right angles to the field lines. a) 2 marks b) What is the average EMF induced in the coil due to its rotation in the field? 6. List one similarity and one difference between an electric motor and an electric generator. 1 mark each Similarity: Difference: 7. The armature of a DC motor has a resistance of 5.0 Q and is connected to a 120 V line. When the motor reaches full speed, the back EMF is 108 V. a) What is the current at "start-up", before the motor begins to run? a) 2 marks b) What is the current when the motor is running at full speed