Sodium ions (Na*) move at 0.857 m/s through a bloodstream in the arm of a person standing near a large magnet. The magnetic field has a strength of 0.254 T and makes an angle of 46.0° with the motion of the sodium ions. The arm contains 90.0 cm3 of blood with a concentration of 2.00 x 1020 Na* ions per cubic centimeter. If no other ions were present in the arm, what would be the magnetic force on the arm? N

Neurons in our bodies carry weak currents that produce detectable magnetic fields. A technique called magnetoencephalography, or MEG, is used to study electrical activity in the brain using this concept. This technique is capable of detecting magnetic fields as weak as 1.1x10−15 T. Model the neuron as a long wire carrying a current and find the current it must carry to produce a field of this magnitude at a distance of 5.2 cm from the neuron.

A singly charged ion of 7Li (an isotope of Lithium) has a mass of 1.16 x 10-26 kg. It is accelerated through a potential difference of 220 V and then enters a magnetic field with magnitude 0.723 T perpendicular to the path of the ion. What is the radius of the ion’s path in the magnetic field?

A loop of wire with radius r= 0.081 m is in a magnetic field with magnitude B as shown in the graph. B changes from B1 = 0.34 T to B2= 6.5 T in At = 7.5 s at a constant rate. Express the magnetic flux going through a loop of radius r assuming a constant magnetic field B. Express the change in the magnetic flux going through this loop, AP, in terms of B , B2 and r. Calculate the numerical value of 4P in T m². Express the magnitude of the average induced electric field, E, induced in the loop in terms of 4P, r and At. E = Calculate the numerical value of E in N/C. E =

A 45.1 C charge is moving with a velocity of 39.6 m/s in the +x-direction. A magnetic field of 89 T is point in the -x-direction. What is the force (in N) on this charge?

Some animals are capable of detecting magnetic fields and use this sense to help them navigate. Suppose a high-voltage direct-current power line carries a current of 4.90 kA. How far from the wire would a homing pigeon have to be so the field due to the wire has magnitude 50.0 μT, which is comparable to Earth’s magnetic field at the surface?

What is the magnitude of the force on an electron moving at 1.0 × 106 m/s perpendicular to a 1.0-T magnetic field?

A magnetic field has a magnitude of 0.0011 T, and an electric field has a magnitude of 6.4 × 103 N/C. Both fields point in the same direction. A positive 1.8-μC charge moves at a speed of 4.2 × 106 m/s in a direction that is perpendicular to both fields. Determine the magnitude of the net force that acts on the charge.

Neurons in our bodies carry weak currents that produce detectable magnetic fields. A technique called magnetoencephalography, or MEG, is used to study electrical activity in the brain using this concept. This technique is capable of detecting magnetic fields as weak as 1.0 x 10-15 T. Model the neuron as a long wire carrying a current and find the current it must carry to produce a field of this magnitude at a distance of 4.5 cm from the neuron. A

AS In Figure P19.21, the cube is 43.0 cm on each edge. Four straight segments of wire -- ab, bc, cd, and da -- form a closed loop that carries a current of I = 5.30 A in the direction shown. A uniform magnetic field of magnitude B = 0.0200 T is in the positive y-direction. Determine the magnitude and direction of the magnetic force on each segment. (Please give the magnitudes to three decimal places.) B Figure P19.21 Segment F(N) Direction ab N -Direction- bc N Direction- cd N -Direction- da N -Direction- Submit Answer