Two long straight current-carrying wires are lined up parallel to one another in vacuum at a distance d. Currents of I and I2 flow through the wires, both in the same direction generating the field of BM at a midpoint between them. Write down an expression for BM in terms of the currents running in each of the wires. Assume vacuum permeability uo = 1. Please use for products (e.g. B*A), "/" for ratios (e.g. B/A) and the usual "+" and "-" signs as annropriate For -1 Use 17A*R), For Greek

A solenoid 10.0 cm in diameter and 68.6 cm long is made from copper wire of diameter 0.100 cm, with very thin insulation. The wire is wound onto a cardboard tube in a single layer, with adjacent turns touching each other. What power must be delivered to the solenoid if it is to produce a field of 9.40 mT at its center?

An accelerating voltage of 2.36 x 10³ V is applied to an electron gun, producing a beam of electrons originally traveling horizontally north in vacuum toward the center of a viewing screen 37.9 cm away. (a) What is the magnitude of the deflection on the screen caused by the Earth's gravitational field? (b) What is the direction of the deflection on the screen caused by the Earth's gravitational field? up down east west (c) What is the magnitude of the deflection on the screen caused by the vertical component of the Earth's magnetic field, taken as 20.0 μT down? east m (d) What is the direction of the deflection on the screen caused by the vertical component of the Earth's magnetic field, taken as 20.0 µT down? north south west mm (e) Does an electron in this vertical magnetic field move as a projectile, with constant vector acceleration perpendicular to a constant northward component of velocity? Yes No O No (f) Is it a good approximation to assume it has this projectile motion? Yes…

Two atoms of the same substance, one singly ionized and the other triply ionized, are eachaccelerated from rest through same potential difference. The ions enter the same uniformmagnetic field at 90 degrees. Derive an expression fora) their velocity (V2/ V1) entering the field. b) their radii (r2/ r1) of curvature in the field.