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_ _ An electron is accelerated through 2,200 V from rest and then enters a region where there is a uniform 1.50 T magnetic field. What are the maximum and minimum magnitudes of the magnetic force acting on this electron? (a) maximum N (b) minimum :N 3. [l2 Points] SERCP11 1953.024. A straight wire carrying a 2.9 A current is placed in a uniform magnetic field of magnitude 0.30 T directed perpendicular to the wire. (a) Find the magnitude ofthe magnetic force on a section ofthe wire having a length of 13 cm. :N (b) Explain why you can't determine the direction of the magnetic force from the information given in the problem. This answer has not been graded yet. Need Help? 4. [l1 Points] SERCP11 1953.035. A wire is formed into a circle having a diameter of 11.0 cm and is placed in a uniform magnetic field of 2.86 mT. The wire carries a current of 5.00 A. Find the maximum torque on the wire. Need Help? Figure a is a diagram of a device called a velocity selector, in which particles of a specific velocity pass through undeflected while those with greater or lesser velocities are deflected either upwards or downwards. An electric field is directed perpendicular to a magnetic field, producing an electric force and a magnetic force on the charged particle that can be equal in magnitude and opposite in direction (see Figure b) and hence cancel. Show that particles with a speed of v = E/B will pass through the velocity selector undeflected. (Submit a file with a maximum size of 1 MB.) Choose File No file chosen This answer has not been graded yet. Bin x + + + + quB Source x X X x X Slit * V x Y Y x Y x x qE a b Need Help? Read It [-/5 Points] DETAILS SERCP11 18.3.P.007.MI. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Consider the following figure. 7.00 0 4.00 0 9.00 0 a W R (a) Find the equivalent resistance between points a and b in the figure. (R = 20.0 0) (b) Calculate the current in each resistor if a potential difference of 10.0 V is applied between points a and b. I (4.00 0) = I (7.00 ) = I (20.0 0) = I (9.00 0) =Consider the circuit shown in the figure below. (Assume R, = 12.5 0 and R2 = 4.00 0.) b 25.0 V R2 20.0 0 a (a) Find the potential difference between points a and b. (b) Find the current in the 20.0-0 resistor. AWe assume the currents in the three branches of this circuit are directed as shown in the diagram below. T13 111?] Ill 2 R3 (D If our assumed directions for the currents are correct, the calculated currents will have positive signs. We apply Kirchhoff's junction rule at point c to obtain 12 e 11 + 13. [1] We apply Kirchhoff's loop rule, going clockwise around loop abcfa to obtain 3'1 7'52 Rzlzi R111 = 0 Solving for 11, we have [1: g'1'g2' 22 R1 so 11=(:x10'\")7(:)5 [21 Applying Kirchhoff's loop rule, going counterclockwise around loop edcfe, we have 3'] 7 R313 7 $2 * R212 = 0. Solving for 13, we have 337% so Three 6.3 0 resistors are connected in series with a 15.0 V battery. Find the following. (a) the equivalent resistance of the circuit (b) the current in each resistor A (c) Repeat for the case in which all three resistors are connected in parallel across the battery. equivalent resistance current in each resistor A Need Help? Read It [-/6 Points] DETAILS SERCP11 18.3.P.008. MY NOTES Consider the combination of resistors shown in the figure below. 12.0 0 4.00 0 W 5.00 0 W 6.00 0 8.00 0 (a) Find the equivalent resistance between point a and b. (b) If a voltage of 23.6 V is applied between points a and b, find the current in each resistor. 12 0 A A A A 8 2 A Need Help? Read It