An electromagnetic flowmeter applies a magnetic field of0.20 {\rm t} to blood flowingthrough a coronary artery at a speed of 15 {\rm cm/s}.
what force is feltby a chlorine ion with a single negative charge?

Explanation:

The force exerted by a magnetic field on a charged particle is given by

where

q is the charge of the particle

v is the speed

B is the magnetic field strength

In this problem we have:

is the strength of the magnetic field

is the velocity

is the magnitude of the charge of a single chlorine ion

Substituting into the equation,

t = 1/400 h   ⇔ 0.0025 h ⇔ 9s ⇔ 0.15 m

any of the answers are correct.