Three resistors of 5 ohms, 10 ohms and 20 ohms are connected in parallel across a 12-v supply. Calculate, i) the combined resistance (ii) the current flowing through each resistor (iii) the total current in the circuit (iv) the electrical power dissipated in through each resistor

An electron and a proton are held on an x axis, with the electron at x = + 1.000 m and the proton at x = - 1.000 m. part a how much work is required to bring an additional electron from infinity to the origin? express your answer with the appropriate units. part b if, instead of the second electron coming in from infinity, it is initially at x = + 20.00 m on the axis and is given an initial velocity of 100.0 m/s toward the origin, does it reach the origin? part c how close to the origin does it come?