Two coils are placed near each other as shown in the figure below. The coil on the left is connected to a battery and a switch, and the coil on the right is connected to a resistor. R (i) What is the direction of the current in the resistor at an instant immediately after the switch is thrown closed? O left O right O The current is zero. (ii) What is the direction of the current in the resistor after the switch has been closed for several seconds? O left O right O The current is zero. (iii) What is the direction of the current in the resistor at an instant after the switch has then been thrown open? O left O right
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- A set of three conducting rings are hung from a ceiling as shown in the Figure and are in the same magnetic field B. The magnetic field is uniform and remains constant with respect to time. Ring 1 moves left and right as indicated, like a mass attached to a pendulum. Ring 2 rotates about a vertical axis, and Ring 3 moves up and down while attached to a spring. Which ring(s) will have an emf induced in them? 1 2 3. O Ring 3 only O Ring 2 only O Ring 1 only O Rings 2 and 3 Rings 1 and 2A loop of wire in the shape of a rectangle of width w and length L and a long, straight wire carrying a current I lie on a tabletop as shown in the figure below. (a) Determine the magnetic flux through the loop due to the current I. (Use any variable stated above along with the following as necessary: Mo.) ФВ (b) Suppose the current is changing with time according to I = a + bt, where a and b are constants. Determine the magnitude of the emf (in V) that is induced in the loop if b = 20.0 A/s, h = 1.00 cm, w = 20.0 cm, and L = 1.20 m. v (c) What is the direction of the induced current in the rectangle? O clockwise O counterclockwise O The magnitude is zero. What If? Suppose a constant current of I = 6.00 A flows in the straight wire and the loop moves from an initial position ho = 1.00 cm toward the bottom of the figure at a constant speed of v = 16.0 cm/s. (d) What is the magnitude of the induced emf (in V) in the loop 1.00 s after it begins to move? V (e) What is the direction of the…Enter an expression for the magnitude of the magnetic flux through the loop using the symbols in the palette below. Your expression must be valid at all times described in the problem statement.
- 17. A U-shaped wire is bridged by a small metal rod AB of length I, and the distance of the rod from the left end of wire is a at initial moment t=0 as indicated in the right figure. A uniform magnetic field is directed into of page. Now move the rod at constant velocity y to the right as indicated.(a) Calculate the magnetic flux through the loop formed by the wire and rod at any instant t. (b) Find the emf induced in the loop as the rod is moving. (c) Indicate the direction of the current induced in the loop. O wire 8 Al -rod t30A loop of wire in the shape of a rectangle of width w and length L and a long, straight wire carrying a current I lie on a tabletop as shown in the figure below. (a) Determine the magnetic flux through the loop due to the current I. (Use any variable stated above along with the following as necessary: H. and r.) (b) Suppose the current is changing with time according to I = a + bt, where a and b are constants. Determine the magnitude of the emf that is induced in the loop if b = 17.0 A/s, h = 1.00 cm, w = 19.0 cm, and L = 1.25 m. V (c) What is the direction of the induced current in the rectangle? O clockwise O counterclockwise O The magnitude is zero.A loop is fixed in position in the location of a magnetic field directed out of the page. The magnetic field gets weaker over time. Determine the direction of the induced current in the wire.
- In this problem, you will use Lenz's law to explore what happens when an electromagnet is activated a short distance from a wire loop. You will need to use the right-hand rule to find the direction of the induced current. Figure < 1 of 1 Switch open E Iron core 0Three conductive loops A, B, and C are shown in the figure below. Each loop has a resistance R and moves at a constant velocity v. As the loops enter a static and uniform magnetic field, a current may be induced in them. In which loop(s) will the current have the largest magnitude? A C O A O B O C O The current is the same in each of them. O No current is induced in any of the coils.In the arrangement shown in the figure, 3.51 A current flows in the same direction from the coils with 320 windings and a radius of 7.50 cm. In this case, when we place the hall probe at a point 3.00 cm from the center of the coils, a deviation of 39 μA is observed in the microammeter connected to the hall probe. Since the microammeter deviates by 51.2 μA when we hold the Hall probe at a distance of 3.00 cm from a bar magnet, calculate the magnetic field of the bar magnet at this distance. (μ0 = 4π x 10-7 T.m/A, π = 3.14)
- = 0, The student then decides to measure Bà at the centre of the coil (x: r = 0) for several different values of N and R. The current in the wire is kept constant at I = 4.00 A and the student records Br(0,0) in Table 2 below.Now the switch on the electromagnet is reopened. The magnitude of the external magnetic flux through the wire loop ______ (A. increases, B. decreases, C. remains constant), and there is _______ (A. zero, B. a clockwise, C. a counterclockwise) current induced in the loop (as seen from the left.