All Courses
Explore Courses UPSC Exam UPSC Test Series Free Notes EduRev Infinity Get the App Login Join for Free
Sign in Open App
JEE Exam  >  JEE Questions  >  An ideal transformer has 500 and the 1000 tur... Start Learning for Free
SaveJoin the Discussion on the App
An ideal transformer has 500 and the 1000 turns in the primary and the secondary coil. If the DC voltage of 120 V is applied to the primary coil, then the emf produced at the secondary coil will be:
  • a)
    60 V
  • b)
    240 V
  • c)
    30 V
  • d)
    Zero
Correct answer is option 'D'. Can you explain this answer?
FREE This question is part of
Download PDF Attempt Test
Download PDF Attempt this Test
Most Upvoted Answer
An ideal transformer has 500 and the 1000 turns in the primary and the...
Given: DC voltage EP = 120 V (Primary coil)
  • The transformer works on the principle of mutual inductance.
  • To induce emf in the secondary coil of the transformer, the magnetic flux associated with the secondary coil must change with respect to time.
  • When the DC voltage is applied at the primary coil of the transformer, the magnetic flux associated with the coil will remain constant with respect to time. So the emf will not induce at the secondary coil.
  • Therefore, when the DC voltage is applied at the primary coil, the induced emf in the secondary coil will be zero.
Free Test
FREE
Start Free Test
Start Free Test
Community Answer
An ideal transformer has 500 and the 1000 turns in the primary and the...
Given:
Primary turns (N1) = 500
Secondary turns (N2) = 1000
DC voltage applied to the primary coil (V1) = 120V

To find:
The emf produced at the secondary coil (V2)

Solution:
The ideal transformer is a device that transfers electrical energy from one circuit to another through electromagnetic induction. It works on the principle of Faraday's law of electromagnetic induction.

Faraday's law of electromagnetic induction:
The induced emf (voltage) in a coil is proportional to the rate of change of magnetic flux passing through the coil.

Step 1: Calculate the magnetic flux in the primary coil:
The magnetic flux (Φ) is given by the formula:
Φ = N1Φ1
where N1 is the number of turns in the primary coil and Φ1 is the magnetic flux.

Step 2: Calculate the emf induced in the primary coil:
The emf induced in the primary coil (V1) is given by the formula:
V1 = -N1(dΦ1 / dt)
where dΦ1 / dt is the rate of change of magnetic flux.

Since the DC voltage is applied to the primary coil, there is no change in magnetic flux (dΦ1 / dt = 0). Therefore, the emf induced in the primary coil is zero.

Step 3: Apply the transformer equation:
The transformer equation relates the voltages and turns in the primary and secondary coils.
V1 / N1 = V2 / N2

Substituting the values:
V1 / 500 = V2 / 1000

Step 4: Calculate the emf induced in the secondary coil:
Rearranging the equation:
V2 = (V1 * N2) / N1
V2 = (120V * 1000) / 500
V2 = 240V

Conclusion:
The emf produced at the secondary coil is 240V. Therefore, the correct answer is option B) 240V.
< Previous Question Next Question >
Explore Courses for JEE exam

Similar JEE Doubts

A thermal power plant produces electric power of 600 kW at 4000 V, which is to be transported to a place 20 km away from the power plant for consumers usage. It can be transported either directly with a cable of large current carrying capacity or by using a combination of step-up and step-down transformers at the two ends. The drawback of the direct transmission is the large energy dissipation. In the method using transformers, the dissipation is much smaller. In this method , a step-up transformer is used at theplant side so that the current is reduced to a smaller value. At the consumers end, a step-down transformer is used to supply power to the consumers at the specified lower voltage. It is reasonable to assume that the power cable is purely resistive and the transformers are ideal with power factor unity. All the currents and voltages mentioned are rms values.Q.In the method using the transformers, assume that the ratio of the number of turns in the primary to that in the secondary in the step-up transformer is 1 : 10. If the power to the consumers has to be supplied at 200 V, the ratio of the number of turns in the primary to that in the secondary in the stepdown transformer is

ParagraphA thermal power plant produces electric power of 600 kW at 4000 V, which is to be transported to a place 20 km away from the power plant for consumers’ usage. It can be transported either directly with a cable of large current carrying capacity or by using a combination of step-up and step-down transformers at the two ends. The drawback of the direct transmission is the large energy dissipation. In the method using transformers, the dissipation is much smaller. In this method, a step-up transformer is used at the plant side so that the current is reduced to a smaller value. At the consumers’ end, a step-down transformer is used to supply power to the consumers at the specified lower voltage. It is reasonable to assume that the power cable is purely resistive and the transformers are ideal with the power factor unity. All the currents and voltage mentioned are rms values.Q.In the method using the transformers, assume that the ratio of the number of turns in the primary to that inthe secondary in the step-up transformer is 1 : 10. If the power to the consumers has to be supplied at200 V, the ratio of the number of turns in the primary to that in the secondary in the step-down transformeris

Top Courses for JEEView all

Top Courses for JEE

An ideal transformer has 500 and the 1000 turns in the primary and the secondary coil. If the DC voltage of 120 V is applied to the primary coil, then the emf produced at the secondary coil will be:a)60 Vb)240 Vc)30 Vd)ZeroCorrect answer is option 'D'. Can you explain this answer?
Question Description
An ideal transformer has 500 and the 1000 turns in the primary and the secondary coil. If the DC voltage of 120 V is applied to the primary coil, then the emf produced at the secondary coil will be:a)60 Vb)240 Vc)30 Vd)ZeroCorrect answer is option 'D'. Can you explain this answer? for JEE 2024 is part of JEE preparation. The Question and answers have been prepared according to the JEE exam syllabus. Information about An ideal transformer has 500 and the 1000 turns in the primary and the secondary coil. If the DC voltage of 120 V is applied to the primary coil, then the emf produced at the secondary coil will be:a)60 Vb)240 Vc)30 Vd)ZeroCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for JEE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for An ideal transformer has 500 and the 1000 turns in the primary and the secondary coil. If the DC voltage of 120 V is applied to the primary coil, then the emf produced at the secondary coil will be:a)60 Vb)240 Vc)30 Vd)ZeroCorrect answer is option 'D'. Can you explain this answer?.
Solutions for An ideal transformer has 500 and the 1000 turns in the primary and the secondary coil. If the DC voltage of 120 V is applied to the primary coil, then the emf produced at the secondary coil will be:a)60 Vb)240 Vc)30 Vd)ZeroCorrect answer is option 'D'. Can you explain this answer? in English & in Hindi are available as part of our courses for JEE. Download more important topics, notes, lectures and mock test series for JEE Exam by signing up for free.
Here you can find the meaning of An ideal transformer has 500 and the 1000 turns in the primary and the secondary coil. If the DC voltage of 120 V is applied to the primary coil, then the emf produced at the secondary coil will be:a)60 Vb)240 Vc)30 Vd)ZeroCorrect answer is option 'D'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of An ideal transformer has 500 and the 1000 turns in the primary and the secondary coil. If the DC voltage of 120 V is applied to the primary coil, then the emf produced at the secondary coil will be:a)60 Vb)240 Vc)30 Vd)ZeroCorrect answer is option 'D'. Can you explain this answer?, a detailed solution for An ideal transformer has 500 and the 1000 turns in the primary and the secondary coil. If the DC voltage of 120 V is applied to the primary coil, then the emf produced at the secondary coil will be:a)60 Vb)240 Vc)30 Vd)ZeroCorrect answer is option 'D'. Can you explain this answer? has been provided alongside types of An ideal transformer has 500 and the 1000 turns in the primary and the secondary coil. If the DC voltage of 120 V is applied to the primary coil, then the emf produced at the secondary coil will be:a)60 Vb)240 Vc)30 Vd)ZeroCorrect answer is option 'D'. Can you explain this answer? theory, EduRev gives you an ample number of questions to practice An ideal transformer has 500 and the 1000 turns in the primary and the secondary coil. If the DC voltage of 120 V is applied to the primary coil, then the emf produced at the secondary coil will be:a)60 Vb)240 Vc)30 Vd)ZeroCorrect answer is option 'D'. Can you explain this answer? tests, examples and also practice JEE tests.
Explore Courses for JEE exam

Top Courses for JEE

Explore Courses

Suggested Free Tests

Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
10M+ students study on EduRev
Get App
© EduRev
Education Revolution
Follow Us
Signup to see your scores go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup