The large magnetic fields used in MRI can produce forces on electric currents within the human body. This effect has been proposed as a possible method for imaging “biocurrents” flowing in the body, such as the current that flows in individual nerves. For a magnetic-field strength of 2 T, estimate the magnitude of the maximum force on a 1-mm-long segment of a single cylindrical nerve with a diameter of 1.5 mm. Assume that the entire nerve carries a current due to an applied voltage of 100 mV (that of a typical action potential). The resistivity of the nerve is 0.6 ω · m. A. 6 × 10 −7 N B. 1 × 10 −6 N C. 3 × 10 −4 N D. 0.3 N
The large magnetic fields used in MRI can produce forces on electric currents within the human body. This effect has been proposed as a possible method for imaging “biocurrents” flowing in the body, such as the current that flows in individual nerves. For a magnetic-field strength of 2 T, estimate the magnitude of the maximum force on a 1-mm-long segment of a single cylindrical nerve with a diameter of 1.5 mm. Assume that the entire nerve carries a current due to an applied voltage of 100 mV (that of a typical action potential). The resistivity of the nerve is 0.6 ω · m. A. 6 × 10 −7 N B. 1 × 10 −6 N C. 3 × 10 −4 N D. 0.3 N
The large magnetic fields used in MRI can produce forces on electric currents within the human body. This effect has been proposed as a possible method for imaging “biocurrents” flowing in the body, such as the current that flows in individual nerves. For a magnetic-field strength of 2 T, estimate the magnitude of the maximum force on a 1-mm-long segment of a single cylindrical nerve with a diameter of 1.5 mm. Assume that the entire nerve carries a current due to an applied voltage of 100 mV (that of a typical action potential). The resistivity of the nerve is 0.6 ω · m.
this is an exam past paper question that i need help with becuase i am reviewing not a graded assignment
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(1)
-13-
end. One box contains nothing inside; one has a piece of resistance wire between the terminals
You are provided with three sealed identical matchboxes labelled A, B and C, with terminals at each
and the other, a semi-conductor diode.
Plan and design an experiment to identify the contents of each box.
You are provided with the following elements for your apparatus:
Ammeter
Low voltage power supply
Connecting wires
Labelled circuit diagram
Draw a well-labelled circuit diagram to show how you would connect the apparatus listed
above to each matchbox.
(3 ma
RAD127 Radiographic Equipment and Computers
SI Units in Radiography
Ch. 1 & 2
Instructions: Provide the units for each of the following in full and short forms
1. Mass - kg, 9 or (1b))
・
2. Energy, Work - W = FD,J
3. Air kerma
-(Gya)
4. Absorbed Dose-
5. Effective Dose
J/kg (94+)
jlkg
J/kg, Sv
6. Radioactivity - 5-1, Bq
7. Weight
8. Time
9. Force
10. Power
B9
wt, wt-mg, N
-(s)
F= ma, N, OR 1b.
(JIS), P= work It = Fdlt, J
Chapter 20 Solutions
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