A closed current path is made from two different circular arcs as shown in the figure below. The larger arc has radius 3.0 cm and covers one quarter of the circle, and the smaller arc has radius 1.0 cm and covers the remaining three quarters of the circle. If the current is 1.5 A going counterclockwise, what is the magnitude of the B-field at the center of the circular arcs? Express your answer to the nearest uT.

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..

Figure 8 shows a coaxial cable (two nested cylinders) of length l, inner radius a and outer radius b. Note that l >> a and l >> b. The inner cylinder is charged to +Q and the outer cylinder is charged to −Q.   The cable carries a current I, which flows clockwise. Use Ampere’s Law to calculate themagnetic field B⃗ at r<a,  a<r<b, and r>b.

Consider the diagram below. One wire is aligned with the x-axis and carries current I1 = 1.0 A. Another wire carries current l2 = 2.0 A out of the page at point (0,1) as shown. P(3, 1) What is the magnitude of the B-field at point P? Express your answer to the nearest nT.

(Answer all three questions in this page according to the description below.) Two lined conductors are connected by a resistor R = 30SN, and separated by L = 5 m. A moving conductor of mass m slides on the conductors at a constant speed v, which produces a current I = 4 %3D A. The conductors are placed in a B = 6 T magnetic field out of the page. In what direction does the current flow through the moving conductor when the bar is sliding in the direction as shown in the figure? R O a. To the left. b. To the right. From the previous question, calculate the speed at which the bar is moving. О а. 40 m/s. O b. 4 m/s. О с. 50 m/s. O d. 5 m/s. From the previous question, calculate the magnitude and direction of magnetic force on the bar. а. 120N down the page. b. 120N dn page. the O c. 50N down the page. O d. 50N up the page.