Ex. 9: The horizontal telegraph wire 100 m long, oriented along magnetic east west falls freely under gravity to the round with a speed of 20 cm/s. The horizontal component of earth's magnetic field is 4.0 x 105 T. Find the e.m.f. induced in the wire of the instant, the wire strikes the ground.
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- You are given a single loop of wire with a radius of 0.32 m and carrying a current of 42.0 A in a clockwise direction as seen from above the loop looking down. Find the strength of the magnetic field produced at the center of this loop.Problem 2: A conductor of length = 15 cm is free to move along two frictionless conductors. When a 5.00 A current passes through the conductors a bar of mass 15.0 g slides upward away from the floor. Find direction and magnitude of the magnetic field required to lift the slider.A long straight wire sits on the z-axis and carries a current of 8.22 amps in the positive z direction. Find the magnitude of the magnetic field produced by this current at position (x,y,z) = (0.646 m, -4.24 m, 2.6 m). Answer in units of T.
- An aluminum rod with a mass of 0.140 kg slides on parallel horizontal steel rails, 0.440 m apart, and carries a current of 15.0 and rails is 0.470. What vertical, uniform magnetic field is needed to keep the rod moving at a constant speed? (Enter the magnitude in mT.) The coefficient of friction between the rodA very long, straight wire carries a current of 0.29 A. This wire is tangent to a single-turn, circular wire loop that also carries a current. The directions of the currents are such that the net magnetic field at the center of the loop is zero. Both wires are insulated and have diameters that can be neglected. How much current is there in the loop?b
- A rigid rectangular current loop abcd is in a uniform magnetic field. The magnetic field is 1.5T and in the y direction. The current is 2.0A and in the directions of blue arrows. The length of ab is 0.5 m and the length of ad is 0,8 m. For the coordinate, the r- and y-axis are along the horizontal and vertical direction on the paper, respectively, and the z-axis points out of the paper. (a) What are the magnitude and direction of the magnetic force on cach side of the loop? V B = 1.5T d I-2A .----------H Fah = direction = Fae = direction = Fad= direction = 0.5 m Fie = direction = (b) Based on your calculation of the magnetic forces, which of the following statements are true regarding the motion of the loop due to the magnetic forces? Explain your reasoning with one or two sentences. Use this rotation diagrams to identify a clockwise or counterclockwise rotation around horizontal (dashed line H) or vertical (dashed line V) axis. The rotation direction is viewedThe figure below shows a long straight wire just touching a circular loop carrying a current I₁ = 2.04 A in the counterclockwise direction. Both lie in the same plane. @ (a) What direction must the current I2 in the straight wire have in order to create a magnetic field at the center of the loop in the direction opposite to that created by the loop? O from right to left O from left to right (b) What current must the long straight wire carry in order have zero net magnetic field strength at the center of the loop? A Additional Materials Reading Tutorial Submit AnguerA long straight wire sits on the z-axis and carries a current of 1.46 amps in the positive z direction. Find the magnitude of the magnetic field produced by this current at position (x,y,z) = (-1.44 m, -3.65 m, 6.04 m). Answer in units of T.