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A rectangular block of iron has the dimensions 1.2cm x 1.2cm x 15 cm What is the resistance of the opposing square ends? What is the resistance between two of the rectangular faces? (The resistivity ‘p’ for iron at room temperature is 9.6 x 10–8 Ω – m) (K. Board 2008) 2 A 50 ohm resistor is required from a copper wire, 0.2 mm in diameter. What is the length of the wire needed?(p = 1.6 x 10–8 Ω-m) (K. Board 2006) 3 Two resistances of 10 ohms and 50 ohms are connected is series with a 6 volt battery. Calculate The charge drawn from the battery per minute. The power dissipated in 10 ohm resistance. (K. Board 2005) Q-5. A 50 ohm resistor is to be wound with platinum wire, 0.1 mm in diameter. How much wire is needed (p = 11 × 10–8 Ωm)? (K. Board 2003) Q-9. Find the equivalent resistance in the given circuit, current I and potential difference between a and b: (K. Board 2003) R1 = 5Ω R2 = 2Ω R3 = 3Ω R4 = 6Ω V = 6 volts 1 Q-13. The resistance of a tungsten wire used in the filament of a 60 watt bulb is 240 Ω when the bulb is hot at a temperature of 2020oC, what would you estimate its resistance at 30oC? (The temperature coefficient of tungsten α 0.0045/oC). (K. Board 2002) Q-19. A battery of 24V is connected to a 10Ω load and current of 2.2 amp is drawn; find the internal resistance of the battery and its terminal voltage. (K. Board 2002) Q-20. Find the equivalent resistance and the current through R3 & R4. Given R1 = 20Ω, (K. Board 2001) R2 = 30Ω, R3 = 20Ω, R4 = 40Ω, R5 = 40Ω Q-25. You are given three resistors each of 2 ohm. How would you arrange these resistors to obtain the equivalent resistances of i) 1.5 ohm ii) 3 ohms iii) 6 ohm? Also prove the result mathematically. (K. Board 2000)