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3a) (6 pts) Draw an arrow showing the direction of the magnetic force on the charge q in each case. Note that the sign of the charge for each example is shown below the picture. OB B B 9 positive q negative 4 positive 3b) (5 pts) A current of 2.5A flows horizontally to the right in a 4.7mm long wire. The wire is placed in a magnetic field of 0.50T which is oriented at 25° to the direction the current is travelling. Find the magnitude of the magnetic force on the wire. 3c) (9 pts) A conducting loop enclosing an area of 0.021m' is in a uniform magnetic field of 0.75T oriented perpendicular to the plane of the loop. If the area is decreased to 24 min 0.0055s, what is the magnitude of the average emf induced in the loop? 0.015 3d) (Spts) A circular wire ring is situated above a long straight wire, as shown in below. The straight wire has a current flowing to the left, and the current is decreasing in time at a constant rate. In which direction does the induced current flow in the loop? (Hint: draw the direction of the magnetic field in the loop due to the current) 1