An object is placed 30.0 cm to the left of a double convex l…

An object is placed 30.0 cm to the left of a double convex lens whose focal points are 20.5 cm from the lens. A double concave lens, whose focal points are 42.5 cm from the lens, is placed 30.0 cm to the right of the first lens. (a) What is the distance between the first lens and the first image from the first lens? (b) What is the distance between the original object and the final image? (c) If the final image is 15.0 cm in height, what is the height of the original object? (d) Is the final image real or virtual, upright or inverted, larger or smaller?

As shown in Fig. 3.1, a 1 . 00   m conducting ro…

As shown in Fig. 3.1, a 1 . 00   m conducting rod in good contact with a frictionless conducting frame moves to the left with a constant speed 4 . 80   m s . The light bulb in the conducting frame has a resistance of 12 . 0   Ω . The entire system is immersed in a magnetic field of magnitude B → = 8 . 00 × 10 3   G which is inclined at 30° with respect to the frame as shown in Fig. 3.1. (a) Find the induced electromotive force on the circuit. (b) What is the direction and magnitude of magnetic force exerted on the rod? To maintain the rod’s constant speed 4 . 80   m s , an external force must be applied on the rod. (c) Determine the work done by the external force after the rod is moved to the left for 5 . 00 meters. If the conducting frame is closed by a fixed conducting rod (the turquoise rod in Fig. 3.2) with a resistance of 6 . 00   Ω to form a rectangular conducting rod as shown in Fig. 3.2, (d) what are the induced electric current through the light bulb and the one through the turquoise rod? (e) What is the direction and magnitude of magnetic force exerted on the rod? To maintain the rod’s constant speed 4 . 80   m s , an external force must be applied on the rod. (f) Determine the work done by the external force after the rod is moved to the left for 5 . 00 meters. (Note: 1   G = 10 – 4   T ) fig_q19_final.jpg