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EmSAT Achieve Exam  >  EmSAT Achieve Questions  >  The magnetic field produced by a solenoid inc... Start Learning for Free
The magnetic field produced by a solenoid increases by:
  • a)
    Changing direction of current
  • b)
    Placing soft iron core inside it 
  • c)
    Changing direction of solenoid
  • d)
    More than one of the above
Correct answer is option 'B'. Can you explain this answer?
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Verified Answer
The magnetic field produced by a solenoid increases by:a)Changing dire...
  • A solenoid is a coil of wire that produces a magnetic field when an electric current passes through it.
  • A soft iron core is a magnetic material that can increase the strength of the magnetic field produced by a solenoid.
  • Solenoid types include the following:
    • Rotary Solenoid.
    • Linear Solenoid.
    • AC-Laminated Solenoid.
    • DC-C Frame Solenoid.
    • DC-D Frame Solenoid.
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The magnetic field produced by a solenoid increases by:a)Changing dire...
Soft Iron Core Effect on Solenoid's Magnetic Field
The presence of a soft iron core inside a solenoid can significantly increase the magnetic field produced by the solenoid. This effect is due to the unique magnetic properties of soft iron.

Soft Iron Core - Magnetic Permeability
Soft iron has a high magnetic permeability, which means it can easily become magnetized in the presence of an external magnetic field. When a soft iron core is placed inside a solenoid, it becomes magnetized by the magnetic field produced by the current flowing through the solenoid.

Concentration and Alignment of Magnetic Field Lines
The soft iron core helps concentrate and align the magnetic field lines produced by the solenoid. This alignment enhances the overall magnetic field strength, resulting in a more powerful magnetic field compared to a solenoid without a core.

Increased Strength and Efficiency
By increasing the magnetic field strength, the soft iron core makes the solenoid more efficient at converting electrical energy into magnetic energy. This increased strength can be beneficial in various applications such as electromagnets, transformers, and electric motors.

Conclusion
In conclusion, placing a soft iron core inside a solenoid can significantly increase the magnetic field produced by the solenoid. This effect is due to the high magnetic permeability of soft iron, which helps concentrate and align the magnetic field lines, resulting in a stronger and more efficient magnetic field.
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On attending a conference, which focused on the role of the services sector in Indian economy I was amazed. The conference gave a very interestingperspectiveon the role of the service sector in the growth of Indian economy in relation to growth rates in agriculture and industry. The current situation in India is that the growth rate of services has overtaken both agriculture and industry and is now contributing to more than 50% of GDP. The service sector has the highest growth rate and is the leastvolatilesector. Growth is particularly marked in public services, IT and financial services.In some areas, the growth rate of the service sector is 40-50% due to increased use of mobile technologies. India, therefore has, a service-oriented economy. It hasnt followed traditional growth models as in China. However, in the process of doing so it has skipped the manufacturing stage and has jumped straight from the agriculture stage to service stage, which is also the main reason for the expansion of the service sector. In fact, the situation now is such that the growth in the service sector can and will support in the agriculture and industrial sectors. However, the only setback for Indian economy is the lack of growth in the manufacturing sector which causes dependence on other countries, which is not so desirable in terms of job creation and increased prosperity.Population is also a major concern of the Indian economy. As the population of India grows so also does the number of dependents in the population in both the lower and higher age groups. In such a scenario of increasing population, especially in an economy which still recovering from crisis, growth becomes difficult. For such an economy to grow it has to invest. Currently, the public sector invests more than it saves. The household sector saves in surplus, but it is not increasing so it cannot continue to support private and public sectors. There is a massive need to spend on agriculture and infrastructure development of the country. Apart from that health and education should also be the priority of the government particularly the education of women in order to reduce the birth rate.According to the passage, which of the following is/ are true about the impact of increasing population on Indian economy?A. If India attempts to absorb all the labour force, it will impact the growth of service sector negatively and in turn hamper the economic growth of the country.B. As the population of the country increases, the number of dependants in the country also increase which in turn increases the pressure on the economy.C. An increasing population can never lead the economy of the country towards prosperity; in fact it can only put strain on the economy of a country.

Comprehension:Flemings Left-Hand Rule and Right-Hand Rule are essential principles for understanding the interaction between magnetic fields, electrical currents, and motion. The Left-Hand Rule, applicable to electric motors, uses the thumb, forefinger, and middle finger each pointing perpendicularly to indicate force direction, magnetic field direction, and current direction, respectively. Conversely, the Right-Hand Rule is used for electric generators, with finger assignments indicating the direction of motion, magnetic field, and induced current, respectively. These rules are pivotal in determining the directionality in electromagnetic applications, with the left-hand rule focusing on force in motors and the right-hand rule on motion in generators.In Flemings left rule, the middle finger represents ________________.

Comprehension:Flemings Left-Hand Rule and Right-Hand Rule are essential principles for understanding the interaction between magnetic fields, electrical currents, and motion. The Left-Hand Rule, applicable to electric motors, uses the thumb, forefinger, and middle finger each pointing perpendicularly to indicate force direction, magnetic field direction, and current direction, respectively. Conversely, the Right-Hand Rule is used for electric generators, with finger assignments indicating the direction of motion, magnetic field, and induced current, respectively. These rules are pivotal in determining the directionality in electromagnetic applications, with the left-hand rule focusing on force in motors and the right-hand rule on motion in generators.What does the forefinger indicate in the Flemings right hand rule?

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The magnetic field produced by a solenoid increases by:a)Changing direction of currentb)Placing soft iron core inside itc)Changing direction of solenoidd)More than one of the aboveCorrect answer is option 'B'. Can you explain this answer?
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