An infinitely long wire carries a current of I = 150 A. Randomized Variables I = 150 A  Part (a)  Consider a circle with a radius r and centered on the wire. Determine the magnitude of the magnetic field B at points along the circle in terms of I and r.   Part (b)  If r = 0.14 m, calculate the numerical value of B in tesla.

A singly-ionized methane atom (mass of 2.66×10-26 kg) follows the dotted path shown when sent into a mass spectrometer with a uniform magnetic field. Assume that the magnetic field in the mass spectrometer is caused by a large solenoid with a radius 54 cm, that is 0.6 m long and made up of 5900 loops. If a 9 T magnetic field is needed to detect a certain compound, how much current needs to be run through the coils of the solenoid? 7.28×102 A 6.56×102 A 1.21×103 A 2.43×107 A 1.11×103 A

A pellet which holds a charge of 10 coulombs is moving upwards (+Y) and driven by an electric field in the same direction with a magnitude of 50 V/m. There is a magnetic field with a magnitude of 25 Tesla’s pointing downwards (-Y). How fast does the pellet need to be going for the magnetic force to cancel the electric force? Group of answer choices 0.5 m/s 2 m/s 4 m/s The forces will cancel out at any speed the pellet may be travelling In this case, the electric force cannot be canceled out by the magnetic force

++ A large cyclotron directs a beam of He nuclei onto a target with a beam current of 0.270 mA. (a) How many Hett nuclei per second is this? ++ Не nuclei/s (b) How long (in s) does it take for 1.40 C to strike the target? (c) How long (in s) before 1.25 mol of He*+ nuclei strike the target?