Question: Answer Question 15 (3 points) () Listen Which statement is true? Both, electrostatic and magnetic forces can do a work on electric charges. Electrostatic forces

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Question 15 (3 points) () Listen Which statement is true? Both, electrostatic and magnetic forces can do a work on electric charges. Electrostatic forces cannot do a work on electric charges. Magnetic forces can do a work on electric charges. Electrostatic forces can do a work on electric charges. Magnetic forces cannot do a work on electric charges. Question 16 (4 points) () Listen A horizontal wire carries an electric current pointing straight away from an observer. From the view point of the observer, the magnetic field produced by by this current: Points to the left O Points to the right Circles the wire clockwise Circles the wire counter-clockwise Question 17 (8 points) Listen You need to run an 25 -V appliance using a wall socket, which provides 120 V AC. If the secondary coil of the transformer has 10 turns, how many turns are there in the primary coil? Round off your answer to ones. The number of turns has no unit. Your Answer: Answer Question 18 (2 points) Listen Transformer can step-up or step-down a DC voltage. True False

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