Since the loop falls down at some later time, the loop will feel a different magnetic field. This will cause a change in the magnetic flux. Write down the expression for the magnetic flux as a function of time.
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- You are evaluating the performance of a large electromagnet. The magnetic field of the electromagnet is zero at t = 0 and increases as the current through the windings of the electromagnet is increased. You determine the magnetic field as a function of time by measuring the time dependence of the current induced in a small coil that you insert between the poles of the electromagnet, with the plane of the coil parallel to the pole faces as for the loop in (Figure 1). The coil has 4 turns, a radius of 0.700 cm, and a resistance of 0.190. You measure the current i in the coil as a function of time t. Your results are shown in (Figure 2). Throughout your measurements, the current induced in the coil remains in the same direction. igure 1 of 2 S N ▼ Part A Calculate the magnetic field at the location of the coil for t = 2.00 s. Express your answer to three significant figures and include the appropriate units. μA ? B = Value Units Submit Request Answer Part B Calculate the magnetic field at…A stationary square coil of area 0.1 m² is brought into the magnetic field 5.5 T with its plane perpendicular to the magnetic field. The coil has 1363 turns. Calculate the magnetic flux linkage through the coil. Give your answer in Sl units. Answer: Choose...You pull a bar magnet out of coil of wire. What are the directions of the induced current and magnetic field? Draw a sketch of the situation, noting whether your answer would change if the magnet’s south pole left the wire instead of the north pole.
- A physicist measures the magnetic field at the center of a loop of wire with N number of turns (not a solenoid) and current I flowing through it. They then triple the number of coils and half the radius of the coil while keeping the current the same. How does the magnetic field compare in the new situation, B2, compared to the first measurement, B1? B2 = (2/3)B1 B2 = 6B1 None of the above B2 = (3/2)B1 B2 = (1/6)B1Chapter 30, Problem 023SN The figure shows two parallel loops of wire having a common axis. The smaller loop (radius r) is above the larger loop (radius R) by a distance x>>R. Consequently, the magnetic field due to the counterclockwise current / in the larger loop is nearly constant throughout the smaller loop. Suppose that x is increasing at the constant rate dx/dt = v. (a) Find an expression for the magnetic flux through the area of the smaller loop as a function of x. In the smaller loop, find (b) an expression for the magnitude of the induced emf and (c) the direction of the induced current. R. (a) ? ENI (ь) 2 Edit (c)In a certain region of empty space, Ez = at, where a is a constant, but Ey and Ex are constant in time. a. What is the magnitude and direction of the magnetic curl in this region in terms of a? b. Suppose that, in this particular case, B always points in the +y direction and is zero on the x = 0 plane. Find By as a function of t, x, y, and z. (Hint: the answer is By = Ɛ0μ0ax + C) c. Assume that a = 1000 (N/C) / s. What is the numerical rate at which By increases or decreases with increasing x at a given instant of time? Do the units make sense?
- A charge moves to the right and then enters a region with a uniform magnetic field as shown. If the charge follows along path 3 , what is the sign of the charge? The charge is positive The charge is negative The charge is neutralA loop of wire has the shape shown in the drawing. The top part of the wire is bent into a semicircle of radius r = 0.30 m. The normal to the plane of the loop is parallel to a constant magnetic field (p = 0°) of magnitude 0.79 T. What is the change AO in the magnetic flux that passes through the loop when, starting with the position shown in the drawing, the semicircle is rotated through half a revolution? B (into paper) ΔΦ = > i * хMotional EMF Below is a rectangle that is being pulled into a magnetic field as shown. The rectangle has a height of h = 0.400 m and is being pulled to the right with a velocity of v = 188.0 m/s. This magnetic field starts where shown, so the left most side of the rectangle has no magnetic field. There is 1 loop with a total resistance of R = 15.40 Ohms. The magnetic field has a magnitude of B = 34.0 mT. That means as the loop moves to the right, the magnetic flux inside the loop is increasing. Magnetic Field (out of the page) Direction of velocity What is the induced current within the wire in this system? (Use a negative sign for clockwise current) Make sure to give your answer with appropriate significant figures and remember that you are looking for a magnitude. Your Answer: Answer units Height
- A straight conductor of fixed length / is moving at 45 degrees to a uniform magnetic field of strength B with constant speed v. Calculate v, if B=8.9 T, /=1.6 m and electromotive force e =5 V. Give your answer in SI units. Answer: Choose.. Previous pagePlease AsapFor a current-carrying loop attached to a fixed axis in a uniform magnetic field, what is the phase angle between the magnetic flux through the loop and the magnetic torque acting on the loop? In other words, what is the angular difference between when flux is maximum and when torque is maximum?