Blood contains charged ions. A blood vessel is 2

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Presentation transcript:

Blood contains charged ions. A blood vessel is 2 Blood contains charged ions. A blood vessel is 2.0 mm in diameter, the magnetic field is 0.080 T, and the blood meter registers a voltage of 0.10 mV. What is the flow velocity of the blood? E = Blv v = E /Bl v = (1.0 X 10-4 V) (0.080 T)(0.0020m) v = 0.63 m/s

A metal rod is forced to move with constant velocity along two parallel metal rails, connected with a strip of metal at one end, as shown in the figure. A magnetic field B = 0.350 T points out of the page. (a) If the rails are separated by 25.0 cm and the speed of the rod is 55.0 cm/s, what emf is generated? (b) If the rod has a resistance of 18.0 W and the rails and connector have negligible resistance, what is the current in the rod? (c) At what rate is energy being transferred to thermal energy? Norah Ali Al- moneef

A solenoid (similar to one used for a class demonstration) has a diameter of 10 cm, a length of 10 cm, and contains 3500 windings with a total resistance of 60 Ohm. The solenoid is connected in a simple loop, modeled above. Initially, the solenoid is embedded in a magnetic field of 0.100 T, parallel to the axis of the solenoid, as shown. This external field is reduced to zero in 0.10 sec. During this 0.1 sec, what is the EMF in the coil, what is the current in the circuit, and what is the direction and magnitude of the magnetic field in the solenoid generated by this current? Norah Ali Al- moneef

First, what is the initial flux? Let us chose current flowing around the circuit in the clockwise direction to be positive. Such a current would generate a magnetic field pointing up in the solenoid (and pointing down outside the solenoid). Thus the initial flux is positive. Flux in one winding of solenoid F = (Area)(Magnetic Field) = p r2 B = 3.14 (0.05m)2 (0.100 T). F = 7.85e-4 T m2 DF = Ff - Fi = 0 - 7.85e-4 Tm2 Dt = 0.100 sec EMF = - N (DF/Dt) = -(3500)(-7.85e-3 T m2/s) = 27.5 V Norah Ali Al- moneef

EMF in loop = 27.5 V EMF – IR = 0 I = EMF/R = (27.5 V) / 60 W =0.458 A Changing flux acts just like a battery EMF – IR = 0 I = EMF/R = (27.5 V) / 60 W =0.458 A Norah Ali Al- moneef