Assume a classical hydrogen atom, in which the electron orbits the proton in a circular path due to the Coulomb's force. Taking the mass of electron to be 9 × 10-³¹ kg and the radius of the orbit to be 5.2 × 10-¹¹ m, calculate the speed of the electron in its orbit. (5

: In parallel-plate diode, the anode is at 250 V with respect to the cathode which is 4 mm away from it. An electron is emitted from cathode with an initial velocity towards anode of 2x106 m/s. Calculate : (i) the arrival velocity of the electron at anode (ii) time of transit (iii) the velocity and distance traveled by the electron after 0.5×10-⁹ S.

If a proton and electron are released when they are 2.0  m apart, find the initial acceleration of electron (in m/s2). The answer (in fundamental SI unit) is ___________ (type the numeric value only)

electrons Two protons (p) and two (e) are arranged on a circle of 5 [cm], with angles 0₁ = 20°, 0₂ = 60°, 03 = 20° and 04 = 60°, as radius r shown in the figure. (qp = +1.6 x 10-1⁹ [C] and qe = -1.6 × 10-19 [C]). The figure is not to scale. 04 y a. Find Enet, the net electric field vector produced at the center of the circle. Enet =([ ])i + ( ]) Ĵ [N/C] b. Where on the circle should a fifth point charge qo be placed (give its angle relative the +x-axis) and what is its value (calculate qo) in order to have Ēnet (the net electric field at the center of the circle) equals zero (Type the detailed solution to this question in the below box, Show all your calculation steps by typing in the box). Р X