Please answer and provide solution to these questions. Thank you!

1. A student has four identical cells, each of & = 5.0V and r = 1.00. How would the student arrange all four cells to get a (a) the maximum possible &, (b) the minimum possible &, and (c) an E of 10.0 V? For each case, determine the total internal resistance. (15 pts) 1. A proton moving horizontally at 3.5x10*m/'s enters a uniform magnetic field of 0.075 T directed upawrd at 30' with the horizontal. Find the magnitude of the magnetic force acting on the proton. 2. The resistance of a rod with a length of 3.0 m and a diameter of 1.0 cm is 56.0 $2. If this rod is stretched to form a wire with a diameter of 0.01 cm, what is its resistance? Assume that in the process of stretching the rod, kits volume did not change. 2. A 2.5 nC particle of mass 5.25x10- kg moves through a uniform magnetic field of 7.5 Tdirected down at 30" in the y-z plane. Find the force on the particle at the instant its velocity is 8.0*10" m/s along the +y-axis. 3. A copper wire is 2.50 m long and has a diameter of 2.5 mm. How much current will it draw when connected to a 3.0 volt source? 4. A toroid with an inner radius of 2.5 cm and an outer radius of 4.0cm. The toroid has 24 turns and carries a current of 2.0 A. Find the magnitude of the magnetic field at (a) r = 3.5 cm and (b) r = 6.0 cm from thre enter of the toroid