  The electron and the proton have a negative electrostatic charge and a positive electrostatic charge respectively. Each charge-and the force associated with that unit of charge-is constant-and equal.(The electron and proton have equal, but oppositely polarized, electrostatic charges.) But there is more. The electron and the proton have a negative electrostatic charge and a positive electrostatic charge respectively. Each charge-and the force associated with that unit of charge-is constant-and equal.
The start of life for the tank did not bode well. The first model came off the factory floor on September 8th 1915. On September 10th, its track came off. The same happened on September 19th when government officials were watching.
Five months after its combat demonstration to the British, in June 1916 the first production line tanks were ready, albeit too late for use at the start of that year's 'big push' - the Battle of the Somme, which began on 1 July 1916.he first combat tank was ready by January 1916 and was demonstrated to a high-powered audience. Convinced, Lloyd George-the Minister of Munitions-ordered production of the heavy Mark I model to begin (the lighter renowned 'Whippets' entered service the following year).