The magnetic field shown in the figure below has a uniform magnitude of 28.0 mT directed into the paper. The initial diameter of the kink is 2.00 cm. x x A. x x x x x Need Help? х х х х x x x x x x x x x 2.00 cm --Select-- x x x x x x x x x x B (a) The wire is quickly pulled taut, and the kink shrinks to a diameter of zero in 51.0 ms. Determine the average voltage induced between endpoints A and B. Include the polarity. magnitude mV polarity x ---Select--- A is positive relative to B. B is positive relative to A. The voltage is zero. x x (b) Suppose the kink is undisturbed, but the magnetic field increases to 104 mT in 4.35 x 10-3 s. Determine the average voltage across terminals A and B, including polarity, during this period. magnitude 7mv polarity ✓

хо хо D Bar Magnet X B W X A E In the region shown in the diagram, the magnitude of the horizontal component of the Earth's magnetic field is about 4 × 10–5 T. Originally, a compass placed at location A points North. Then a bar magnet is placed parallel to the surface of the Earth at the location shown in the diagram, with its center 10.1cm from location A. With the magnet present, the compass needle points 78.6° West of North. Which pole on the magnet is closest to the compass?

The magnetic field inside an instrument is(B→=( 2.3 i^i^ - 1.4 j^)Tj^)T where B→ represents the magnetic field vector and TT stands for tesla, the unit of the magnetic field. a) What is the magnitude of the magnetic field? b) What is the direction of the magnetic field?

Item 12 ▼ Part A Find the radius of an electron's orbit when it moves perpendicular to a magnetic field of 0.66 T with a speed of 6.25×105 m/s. Express your answer using two significant figures. V—| ΑΣΦ T = Submit Request Answer ? μm

Part (a)  Express the magnitude of the magnetic force, F, in terms of q, v, and B. F = ______  Part (b)  Express the radius, R, of the circular motion in terms of the centripetal acceleration a and the speed v.  R = ______

A magnetic field directed into the page changes with time according to B = 0.035 or? + 1.40, where B is in teslas and t is in seconds. The field has a circular cross section of radius R = 2.50 cm (see figure below). x x x x * * x X x x x xx x X X x x X x x x x x R x * x x x x X x x x x x Bin (a) When := 4.70 s and r = 0.020 0 m, what is the magnitude of the electric field at point P,? N/C (b) When = 4.70 s and r,= 0.020 0 m, what is the direction of the electric field at point P,? O perpendicular to r2 and clockwise O perpendicular to r, and counterclockwise into the page O out of the page

The magnetic field shown in the figure below has a uniform magnitude of 26.0 mT directed into the paper. The initial diameter of the kink is 2.00 cm. x x A. x * x x x x x x x x x x x x x x x x ---Select--- 2.00 cm ---Select--- x x x X x x X x X x x x x X x x XOX B x (a) The wire is quickly pulled taut, and the kink shrinks to a diameter of zero in 49.0 ms. Determine the average voltage induced between endpoints A and B. Include the polarity. magnitude mV polarity x -3 (b) Suppose the kink is undisturbed, but the magnetic field increases to 105 mT in 4.05 x 107 s. Determine the average voltage across terminals A and B, including polarity, during this period. magnitude mV polarity