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Forty electric bulbs are connected in series acrossa 220 V supply. After one bulb is fused theremaining 39 are connected again in seriesacross the same supply. The illumination will be     [1989]
  • a)
    more with 40 bulbs than with 39
  • b)
    more with 39 bulbs than with 40
  • c)
    equal in both the cases
  • d)
    in the ratio 402 : 392
Correct answer is option 'B'. Can you explain this answer?
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Most Upvoted Answer
Forty electric bulbs are connected in series acrossa 220 V supply. Aft...
Obviously is the number of bulbs is reduced in a series combination, the pd across each is increased and thus the power received by each. Thus each bulb will then glow brighter.
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Read the following text and answer the following questions on the basis of the same: Spark coil The principle of electromagnetic induction was discovered by Michael Faraday in 1831. Induction coils were used widely in electrical experiments and for medical therapy during the last half of the 19th century, eventually leading to the development of radio in the 1890's. The spark coil designed on the principle of electromagnetic induction was the heart of the earliest radio transmitters. Marconi used a spark coil designed by Heinrich Rhumkorff in his early experiments. An induction coil or "spark coil" is a type of electrical transformer used to produce high-voltage pulses from a low-voltage (DC) supply. To create the flux changes necessary to induce voltage in the secondary coil, the direct current in the primary coil is repeatedly interrupted by a vibrating mechanical contact called interrupter.The spark scoil consists of two coils of insulated wire wound around a common iron core. One coil, called the primary coil, is made from relatively few (tens or hundreds) turns of coarse wire. The other coil, the secondary coil typically consists of up to a million turns of fine wire (up to 40 gaug e). An electric current is passed through the primary, creating a magnetic field. Because of the common core, most of the primary's flux couples with the secondary. When the primary current is suddenly interrupted, the magnetic field rapidly collapses. This causes a high voltage pulse to be developed across the secondary terminals due to electromagnetic induction. Because of the large number of turns in the secondary coil, the secondary voltage pulse is typically many thousands of volts. This voltage is sufficient to create an electric spark, to jump across an air gap separating the secondary's output terminals. For this reason, this induction coils are also called spark coils. To operate the coil continually, the DC supply current must be repeatedly connected and disconnected. To do that, a magnetically activated vibrating arm called an interrupter is used which rapidly connects and breaks the current flowing into the primary coil. The interrupter is mounted on the end of the coil next to the iron core. When the power is turned on, the produced magnetic field attracts the armature. When the armature has moved far enough, contacts in the primary circuit breaks and disconnects the primary current. Disconnecting the current causes the magnetic field to collapse and create the spark. A short time later the contacts reconnect, and the process repeats. An arc which may form at the interrupter contacts is undesirable. To prevent this, a capacitor of 0.5 to 15 μF is connected across the primary coil.What is the function of interrupter in a spark coil?

Read the following text and answer the following questions on the basis of the same:Spark coil The principle of electromagnetic induction was discovered by Michael Faraday in 1831. Induction coils were used widely in electrical experiments and for medical therapy during the last half of the 19th century, eventually leading to the development of radio in the 1890's. The spark coil designed on the principle of electromagnetic induction was the heart of the earliest radio transmitters. Marconi used a spark coil designed by Heinrich Rhumkorff in his early experiments. An induction coil or "spark coil" is a type of electrical transformer used to produce high-voltage pulses from a low-voltage (DC) supply. To create the flux changes necessary to induce voltage in the secondary coil, the direct current in the primary coil is repeatedly interrupted by a vibrating mechanical contact called interrupter.The spark scoil consists of two coils of insulated wire wound around a common iron core. One coil, called the primary coil, is made from relatively few (tens or hundreds) turns of coarse wire. The other coil, the secondary coil typically consists of up to a million turns of fine wire (up to 40 gaug e). An electric current is passed through the primary, creating a magnetic field. Because of the common core, most of the primary's flux couples with the secondary. When the primary current is suddenly interrupted, the magnetic field rapidly collapses. This causes a high voltage pulse to be developed across the secondary terminals due to electromagnetic induction. Because of the large number of turns in the secondary coil, the secondary voltage pulse is typically many thousands of volts. This voltage is sufficient to create an electric spark, to jump across an air gap separating the secondary's output terminals. For this reason, this induction coils are also called spark coils. To operate the coil continually, the DC supply current must be repeatedly connected and disconnected. To do that, a magnetically activated vibrating arm called an interrupter is used which rapidly connects and breaks the current flowing into the primary coil. The interrupter is mounted on the end of the coil next to the iron core. When the power is turned on, the produced magnetic field attracts the armature. When the armature has moved far enough, contacts in the primary circuit breaks and disconnects the primary current. Disconnecting the current causes the magnetic field to collapse and create the spark. A short time later the contacts reconnect, and the process repeats. An arc which may form at the interrupter contacts is undesirable. To prevent this, a capacitor of 0.5 to 15 μF is connected across the primary coil.Spark coil is a type of

Forty electric bulbs are connected in series acrossa 220 V supply. After one bulb is fused theremaining 39 are connected again in seriesacross the same supply. The illumination will be [1989]a)more with 40 bulbs than with 39b)more with 39 bulbs than with 40c)equal in both the casesd)in the ratio 402 : 392Correct answer is option 'B'. Can you explain this answer?
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Forty electric bulbs are connected in series acrossa 220 V supply. After one bulb is fused theremaining 39 are connected again in seriesacross the same supply. The illumination will be [1989]a)more with 40 bulbs than with 39b)more with 39 bulbs than with 40c)equal in both the casesd)in the ratio 402 : 392Correct answer is option 'B'. Can you explain this answer? for Class 12 2024 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about Forty electric bulbs are connected in series acrossa 220 V supply. After one bulb is fused theremaining 39 are connected again in seriesacross the same supply. The illumination will be [1989]a)more with 40 bulbs than with 39b)more with 39 bulbs than with 40c)equal in both the casesd)in the ratio 402 : 392Correct answer is option 'B'. Can you explain this answer? covers all topics & solutions for Class 12 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Forty electric bulbs are connected in series acrossa 220 V supply. After one bulb is fused theremaining 39 are connected again in seriesacross the same supply. The illumination will be [1989]a)more with 40 bulbs than with 39b)more with 39 bulbs than with 40c)equal in both the casesd)in the ratio 402 : 392Correct answer is option 'B'. Can you explain this answer?.
Solutions for Forty electric bulbs are connected in series acrossa 220 V supply. After one bulb is fused theremaining 39 are connected again in seriesacross the same supply. The illumination will be [1989]a)more with 40 bulbs than with 39b)more with 39 bulbs than with 40c)equal in both the casesd)in the ratio 402 : 392Correct answer is option 'B'. Can you explain this answer? in English & in Hindi are available as part of our courses for Class 12. Download more important topics, notes, lectures and mock test series for Class 12 Exam by signing up for free.
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