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An electric bulb rated 220 V and 60 W is...

An electric bulb rated `220 V and 60 W` is connected in series with another electric bulb rated `220 V and 40 W`. The combination is connected across a source of `emf 220 V`. Which bulb will glow more?

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To determine which bulb will glow more brightly when connected in series, we need to analyze the situation step by step. ### Step 1: Calculate the Resistance of Each Bulb The resistance \( R \) of a bulb can be calculated using the formula: \[ R = \frac{V^2}{P} \] where \( V \) is the voltage rating of the bulb and \( P \) is the power rating. ...
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CENGAGE PHYSICS ENGLISH-HEATING EFFECT OF CURRENT-Exercise 7.1
  1. A heater joined in series with a 50 W bulb is connected to the mains ...

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  2. Each of three resistors in fig. 7.12 has a resistance of 2 Omega and c...

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  3. An electric bulb rated 220 V and 60 W is connected in series with anot...

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  4. We have a 30 W, 6 V bulb , which we want to glow by a supply of 120 V ...

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  5. Two heater coils made of the same material are connected in parallel a...

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  6. A series circuit consists of three identical lamps connected to a batt...

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  7. Two wires of the same material and having the same uniform area of cro...

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  8. Water boils in an electric kettle in 15 min after being switched on . ...

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  9. An electric motor operating on a 50 V dc supply draws a current of 12...

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  10. A fuse with a circular cross - sectional radius of 0.15 mm blows at 1...

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  11. A motor operating on 120 V draws a current of 2 A . If the heat is dev...

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  12. The walls of a closed cubical box of edge 40 cm are made of a material...

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  13. Two tungsten lamps with resistances R(1) and R(2), respectively , are ...

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  14. n identical bulbs are connected in series and illuminated by a power s...

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  15. An electric motor is designed to work at 100 Vand draws a current of ...

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  16. A house is fitted with certain numbers of 100 W, 230 V incandescent la...

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  17. A house is fitted with seven tubelights of rating 220 V, 40 W each , t...

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  18. Two bulbs are marked 200 V, 300 W and 200 V, 600 W, respectively. The ...

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  19. A servo voltage stabiliser restricts the voltage output to 220 V +- 1%...

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  20. The efficiency of a cell when connected to a resistance R is 60 %. Wha...

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