A 1.4 m wire carries a current of 7.0 A toward the +x direction. A magnetic force of 4.1 x 10^-6 N acts on wire in the -y direction.
a) Find the magnitude of the magnetic field
producing the force.
Answer in units of T.

b) What is its direction?
1. None of these
2. -y direction. 3. -z 4. +x. 5. -x. 6. +z. 7. +y

The ultracentrifuge is an important tool for separating and analyzing proteins. because of the enormous centripetal accelerations, the centrifuge must be carefully balanced, with each sample matched by a sample of identical mass on the opposite side. any difference in the masses of opposing samples creates a net force on the shaft of the rotor, potentially leading to a catastrophic failure of the apparatus. suppose a scientist makes a slight error in sample preparation and one sample has a mass 10 mg larger than the opposing sample. if the samples are 12 cm from the axis of the rotor and the ultracentrifuge spins at 70,000 rpm, what is the magnitude of the net force on the rotor due to the unbalanced samples? ( be thorough on your answer)

Ihave a density of 1.61g/cm^3 and a mass of 28g. find the missing value

Athird point charge q3 is now positioned halfway between q1 and q2. the net force on q2 now has a magnitude of f2,net = 5.861 n and points away from q1 and q3. what is the value (sign and magnitude) of the charge q3?