According to the figure, a uniform bar of length L carries a current I in the direction from point "a" to point "b". The bar is in a uniform magnetic field directed toward the page. Consider the torque about an axis perpendicular to the bar at point "a" that produces the force that the magnetic field exerts on the bar. Based on the above, answer the following question: How can the direction of a magnetic field be determined solely by qualitative observations of the magnetic force on a straight current-carrying wire? Explain in detail.

According to the figure, a uniform bar of length L carries a current I in the direction from point "a" to point "b". The bar is in a uniform magnetic field directed toward the page. Consider the torque about an axis perpendicular to the bar at point "a" that produces the force that the magnetic field exerts on the bar. Based on the above, answer the following question: How can the direction of a magnetic field be determined solely by qualitative observations of the magnetic force on a straight current-carrying wire? Explain in detail.

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What is the magnitude of the magnetic flux (Pinitial) through the coil before it is rotated? Express your answer numerically, in webers, to at least three significant figures. In a physics laboratory experiment, a coil with 250 turns enclosing an area of 13.1 cm? is rotated during the time interval 3.80x10-2 s from a position in which its plane is perpendicular to Earth's magnetic field to one in which its plane is parallel to the field. The magnitude of Earth's magnetic field at the lab location is 6.00x10-5 T. • View Available Hint(s) V ΑΣφ ? |Pinitial| = Wb Submit Part B What is the magnitude of the magnetic flux Pfinal through the coil after it is rotated? Express your answer numerically, in webers, to at least three significant figures. • View Available Hint(s) ΑΣφ |Pfinal| = Wb 圓

Imagine winding N turns of wire in a circular loop of radius R. Each turn in this coil acts like a loop of radius R, so the magnetic field at the coil's center is N times larger than that for a single loop of the same size. If the wire can safely carry 1 amp of current, how many turns would you need to produce a magnetic field of 1 millitesla (approximately 20 times |Bearth|) at the center of a coil 20 centimeters in diameter? (Hint: the answer is 159)
A battery is connected to wires that hand vertically (gravity acts down in the diagram). Hooks at the ends of the wires hold a horizontal copper bar (the thick bar) of mass 0.6 kg and length 0.5 meters. Another apparatus (not shown) can create a uniform magnetic field in the region of space given by the dashed rectangle. The total resistance of the circuit is 1.20 Ohms and the battery supplies 24 Volts. The magnetic field can be adjusted in strength until the bar lifts off of the hooks and levitates magnetically – not moving just above the hooks as shown. a) Determine the necessary direction of the magnetic field in the dashed rectangle. b) Calculate the required magnitude of the magnetic field.
A conducting bar of length ℓ moves to the right on two frictionless rails as shown in the figure below. A uniform magnetic field directed into the page has a magnitude of 0.330 T. Assume R = 8.70 Ω and ℓ = 0.390 m. A vertical bar and two parallel horizontal rails lie in the plane of the page, in a region of uniform magnetic field, vector Bin, pointing into the page. The parallel rails run from left to right, with one a distance ℓ above the other. The left ends of the rails are connected by a vertical wire containing a resistor R. The vertical bar lies across the rails to the right of the wire. The bar moves to the right with velocity vector v. (a) At what constant speed should the bar move to produce an 8.60-mA current in the resistor? m/s(b) What is the direction of the induced current? clockwisecounterclockwise into the pageout of the page (c) At what rate is energy delivered to the resistor? mW(d) Explain the origin of the energy being delivered to the resistor.
Consider the following arrangement in the Figure: a) Calculate the magnitude of the magnetic field at point P of the figure in terms of R, I₁, I₂. Express your answer in terms of the variables I1, I2, R, and magnetic constant po. b) What does your expression give when I1=I₂? 2
As shown in the figure below, a circular ring with a radius of a is folded along a line across the diameter so that the two semicircles are perpendicular. In the magnetic field, this ring was rotated at a constant angular velocity over time, as shown in the figure. The axis of rotation is an extension of the fold-off line and is perpendicular to the magnetic field. The resistance of the ring is R. (1) Give a qualitative explanation of what will happen. (2)Find the current flowing through the ring. (3)What torque should be applied to the ring to allow it to rotate at a constant angular speed? (4)What do you have to do to turn it N round? (5) What energy changes from ring to heat? (6) How much energy changes from ring to heat? * I'll be so thankful and satisfied to get answer just least 3 of 6 questions..
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 page