The setup alongside shows four metal bolts with different number of windings on each. The windings (wires) are connected to a
power source.
6.1 What is this setup known as?
6.2 Which one of the four bolts will have the biggest (strongest) effect?
6.3 To which main requirement must the wire, which is turned around
the bolt comply?​​

Two 1.20-m nonconducting wires meet at a right angle. one segment carries + 2.50 µc of charge distributed uniformly along its length, and the other carries - 2.50 µc distributed uniformly along it, as shown in fig. 21.50. ( a. find the magnitude and direction of the electric field these wires produce at point p, which is 60.0 cm from each wire. ( b. if an electron is released at p, what are the magnitude and direction of the net force that these wires exert on it?