2.0 M O 100 A, clockwise O 20 A, clockwise хх ХХ xx xx x 2.0 M The square loop in the picture has resistance of 5.0 ohms. A uniform magnetic field points in the direction shown with a magnitude decreasing at a rate of 25 T/s. What current is induced in the loop? х в X х х х х хх х х х х O 5 A, clockwise 0 20 A, counterclockwise O 100 A, counterclockwise
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- ←1.0m3 ↑ XXX xxx 1.0m xxx ↓ x is direction. of B 个 [.0m xxx xxx xxx V=4.0m/s X Consider the two scenarios (i) and (ii). (i) has a square wire in a magnetic field where the field changes -2.0 T/s. (ii) is in a constant magnetic field, B = 0.50 T but has a conducting bar that moves to the right at 4.0 m/s. Both scenarios have a total resistance of 2.0 2. (a) What is the EMF (voltage) in the wire loops in each scenario? (b) What is the current and direction of the current in each scenario?A circular coil with radius 0.564 m has 50 turns of wire in it. The total resistance of the coil is R and it is sitting in a perpendicular magnetic field of 10 T. As the magnetic field is ramped to zero over a period of 2 s, a 5.0 A current is induced in the coil. What is R? Hig Ο 10 Ω 15 Ω 30 ΩL R = 5.00 Q X Xix x 1 |X X X X R P = FexV =8.50 J/s Fext W X xx x X X X X X X X X A rectangular wire loop of length L, width w, is pulled out of a constant, uniform magnetic field with constant velocity v. The loop has a resistance R. The magnetic field of magnitude B, points into the plane of the paper, and is confined to the rectangular region shown above. Work must be done on the loop at the rate of P, to move it through the magnetic field at constant velocity. Find the magnitude of the emf, & and the current I for the loop.
- The figure below shows a top view of a bar that can slide on two frictionless rails. The resistor is R = 5.80 , and a 2.50-T magnetic field is directed perpendicularly downward, into the page. Let = 1.20 m. R * X x * x X X X x x X x x X X x x x * * x x * x x x x x x * X x x * * x Bin X *F X * app (a) Calculate the applied force required to move the bar to the right at a constant speed of 2.30 m/s. N (to the right) (b) At what rate is energy delivered to the resistor? WW L X X X X X X X X X X X X X X X X X XX XXXX B 18 X X X X X X X X LB At t=0, a rectangular coil of resistance R = 2 ohms and dimensions w = 3 cm and L = 8 cm enters a region of constant magnetic field B = 1.6 T directed into the screen as shown. The length of the region containing the magnetic field is LB = 15 cm. The coil is observed to move at constant velocity v = 5 cm/s. What is the force required at time t = 0.8 sec to maintain this velocity? F(0.8 sec) = N SubmitA generator is designed to produce a maximum emf of 190 V while rotating with an angular speed of 3600 rpm . Each coil of the generator has an area of 1.8×10−2 m2 . If the magnetic field used in the generator has a magnitude of 4.3×10−2 T , how many turns of wire are needed? Express your answer using two significant figures.
- AsapThe figure below shows a top view of a bar that can slide on two frictionless rails. The resistor is R = 5.00 , and a 2.50-T magnetic field is directed perpendicularly downward, into the page. Let l = 1.20 m. R X * X x X X xxxxxx X e xxxxx X X xxxx x x xx x x x xx x xxx xxx x → X x> * X X *F X x X X Bin app (a) Calculate the applied force required to move the bar to the right at a constant speed of 1.70 m/s. N (to the right) (b) At what rate is energy delivered to the resistor? WYou wish to construct a solenoid with a diameter of 2.00 cm that will produce a magnetic field of 3.40 x 10-2T at its center when a current of 12.0 A is passing through the coils. You want the resistance of the coil wire to be 5.80 N. The resistivity of the wire used is 1.70 x 10-8 N •m (at 20.0°C), and you are using a wire that has a cross sectional area of 3.14 × 10-8 m2. (Note that this solenoid may not necessarily be so tightly wound that the adjacent loops of wire will touch each other. Nonetheless, you may assume that it behaves like an ideal solenoid.) Determine the following. (a) number of turns needed on the solenoid turns (b) length of the solenoid