Each of the resistors in the circuit shown have a resistance of 160.0 ohm. What

Question

Each of the resistors in the circuit shown have a resistance of 160.0 ohm. What is the equivalent resistance of the circuit? (a) 6400.0 ohm (b) 400.0 ohm (c) 480.0 ohm (d) 160.0 ohm Copper wire #1 has a length L and a radius b Copper wire #2 has a length 2L and a radius 2b. Which statement is true? (a)The total resistance of wire #1 is twice as high as that of wire #2. (b)The total resistance of wire #1 is equal to that of wire #2. (c) The total resistance of wine #1 is half that of wire #2. (d)The total resistance of wire #1 is four times higher than that of wire #2. A 130 turn circular coil has a diameter of 5.2 cm. A magnetic field perpendicular to the coil is changing at 0.75 T. The induced emf in the coil is (a) 0.07 V (b) 0.14 V (c) 0.21 V (d) 0.28 V A 120 V emf across a transformer's 200 turn primary coil. How many turns should the secondary have in order to produce a 30 V emf? (a) 25 (b) 50 (c) 75 (d) 100 While a magnet is moved toward the end of a solenoid, a voltage difference is induced between the two ends of the solenoid wire. The voltage difference would be larger if (a) the speed of the magnet were increased. (b) the solenoid contained more loops (while having the same length). (c) the bar magnet produced a stronger magnetic field. (d) All of the above statements are true. (e) None of the above statements are true. A rod with a proper length of 1.0m lies along the x-axis and is moving in the +x direction at 0.8c relative to you. You measure its length to be (a) 0.4 m (b) 0.6 m (c) 0.8 m (d) 0.9 m Electrons in electron microscope must have de Broglie wavelength of 0.45nm. What's the electrons' speed? (a) 5.6 times 10^5 m/s (b) 1.6 times 10^6 m/s (c) 7.2 times 10^6 m/s

Explanation / Answer

here,

3)

two 160 ohm resistance are in parallel, their equivalent resistance , R1 = 160/2 = 80 ohm

80 ohm and two 160 ohm resistances are in series , the equivalent resistance , R = 80 + 160 + 160 ohm

R = 400 ohm

so the equivalent resistance is b) 400 ohm

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