s induced 30. A typical D-cell battery has 75000 J of chemical ed into a energy
ID: 2029722 • Letter: S
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s induced 30. A typical D-cell battery has 75000 J of chemical ed into a energy stored in it. Assuming that all of this can be utilitzed, how long can this battery power a circuit ice as the voltage that draws 3 W? a. 12.3 days b. 6.9 hr c. 25000 hr d. 23 sec e. 48 min 31. If we use bowling balls rolling down a rock-strewn hill as an analogy to an electrical circuit, the rate at which the balls flow down the hill is equivalent to the electric of ibe potential b. current c. charge d. resistance e. power 32. How much work does it take to move a +3C charged particle from a potential of O V toa potential of 30 V? a. 0J b. 3J c. 30J d. 90J e. 33 J 33. You are given three objects, A, B and C. A is positively charged but nothing is known about the charge states of B and C. A repels B, and B attracts C. What can be predicted about the interaction of A and C? a. They will attract b. They will repel c. There will be no interaction d. Not enough information to say 34. Which has the larger resistance? A 60-W or 100-W lightbulb? a. 60 W b. 100 W c. same resistance. 35. A 60-W and 100-W lightbulb are placed in a series circuit. Compared to the current through the 60-W bulb, the current through the 100-W bulb will be a. greater b. smaller c. the same.Explanation / Answer
30. Given totall energy available = 75000 J
Also given that the circuit draws 3W power i.e 3J per sec
So duration upto which battery will power the circuit is 75000 / 3 = 25000 sec = 6.9hour
SO the correct answer is option 'b'
31. The rate at which the ball falls down the hill is equivalent to the electric current Since the current is also equal to the rate of flow of charge.
So the correct answer is option 'b'
32. work = Q * V = 3 * 30 = 90 J
So the correct answer is option 'd'
33. Since A is positively charged and A repels B so B is positively charged too
Since B attracts C so C is negatively charged.
SInce A is positively charged and C is negatively charged so they both will attract each other.
So the correct answer is option 'a'
34. We know that P = V2 / R that is R = V2 / P
Since voltage accross both the bullb is same and resistance R is inversely proportional to power P
In the given case 60W bulb has smaller power than 100W bulb. So bulb A has larger resistance.
So the correct answer is option 'a'
35. Since the both bulbs are connected in series so the same amount of current flows in each bulb.
So the correct answer is option 'c'
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