The force required to stretch a Hooke's-law spring varies from 0 N to 21.3 N as we stretch
the spring by moving one end 16.1 cm from
its unstressed position.
Find the force constant of the spring.
Answer in units of N/m.
Find work done in stretching the spring

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?