English
Maharashtra State BoardSSC (English Medium) 10th Standard

Which of the following scientist invented the rule of electromagnetic induction?

Advertisements
Advertisements

Question

Which of the following scientist invented the rule of electromagnetic induction?

Options

  • Newton

  • Kepler

  • Mendeleev

  • Michael Faraday

MCQ
Advertisements

Solution

Michael Faraday

shaalaa.com
  Is there an error in this question or solution?
Chapter 4: Effects of electric current - Choose the correct option. [Page 5]

APPEARS IN

SCERT Maharashtra Science and Technology Part 1 [English] Standard 10 Maharashtra State Board
Chapter 4 Effects of electric current
Choose the correct option. | Q 10. | Page 5

RELATED QUESTIONS

The phenomenon of electromagnetic induction is


If ‘R’ is the radius of dees and ‘B’ be the magnetic field of induction in which positive charges (q) of mass (m) escape from the cyclotron, then its maximum speed (vmax) is _______.

A) `(qR)/(Bm)`

B)`(qm)/(Br)`

C) `(qBR)/m`

D) `m/(qBR)`


Name a common device that uses electromagnets.


 How does an electromagnet differ forma permanent magnet?  

 


What condition is necessary for the production of current by electromagnetic induction?


 Describe different ways to induce current in a coil of wire.


In which of the following case does the electromagnetic induction occur?
The current is stopped in a wire held near a loop of wire .


Consider the energy density in a solenoid at its centre and that near its ends. Which of the two is greater?


A conducting rod is moved with a constant velocity v in a magnetic field. A potential difference appears across the two ends _____________ .


L, C and R represent the physical quantities inductance, capacitance and resistance respectively. Which of the following combinations have dimensions of frequency?

(a) `1/(RC)`

(b) `R/L`

(c) `1/sqrt(LC)`

(d) C/L


Calculate the dimensions of (a) \[\int \overrightarrow{E} . d \overrightarrow{l,}\] (b) vBl and (c) \[\frac{d \Phi_B}{dt}.\] The symbols have their usual meaning.


Draw a simple labeled diagram of a step-up transformer.


A coil has a self-inductance of 0·05 Henry. Find the magnitude of the emf induced in it when the current flowing through it is changing at the rate of 100 As-1.


Answer the following:

State the principles of the electric motor and electric generator. 


Draw a labelled diagram to show how an electromagnet is made.


List some of the practical applications of an electromagnet.


The energy stored in a 50 mH inductor carrying a current of 4 A is ______ 


Using Ampere's law, obtain an expression for the magnetic induction near a current-carrying straight infinitely long wire. 


Write Fleming’s right hand thumb rule with the help of diagram.


Give an illustration of determining direction of induced current by using Lenz’s law.


A straight metal wire crosses a magnetic field of flux 4 mWb in a time 0.4 s. Find the magnitude of the emf induced in the wire.


The magnetic flux passing through a coil perpendicular to its plane is a function of time and is given by OB = (2t3 + 4t2 + 8t + 8) Wb. If the resistance of the coil is 5 Ω, determine the induced current through the coil at a time t = 3 second.


A closely wound circular coil of radius 0.02 m is placed perpendicular to the magnetic field. When the magnetic field is changed from 8000 T to 2000 T in 6 s, an emf of 44 V is induced in it. Calculate the number of turns in the coil.


An induced current of 2.5 mA flows through a single conductor of resistance 100 Ω. Find out the rate at which the magnetic flux is cut by the conductor.


A layer of atmosphere that reflects medium frequency radio waves which is ineffective during night, is ______.


A cylindrical bar magnet (A) and similar unmagnetized cylindrical iron bar (B) are dropped through metallic pipe. The time taken to come down by ____________.


For magnetic breaking in trains, strong electromagnets are situated above the rails in some electrically powered trains. When the electromagnets are activated, the ...A... induced in the rails oppose the motion of the train. As there are no ... B... linkages, the ...C... effects is smooth. Here, A, B and C refer to ______.

Ansari Sir was demonstrating an experiment in his class with the setup as shown in the figure below.

A magnet is attached to a spring. The magnet can go in and out of the stationary coil. He lifted the Magnet and released it to make it oscillate through the coil.
Based on your understanding of the phenomenon, answer the following question.

What will be observed when the Magnet starts oscillating through the coil. Explain the reason behind this observation.


Sea turtles return to their birth beach many decades after they were born due to ______.


A 0.4 m wire, stretched horizontally, carries an electric current of 15 A, in a magnetic field whose magnetic field intensity is 0.1 N/Am. What is the magnitude of the wire?


A conductor of length 50 cm carrying a current of 5 A is placed perpendicular to a magnetic field of induction 2×10 -3T. Find the force on the conductor.


A rectangular, a square, a circular and an elliptical loop, all in the (x - y) plane, are moving out of a uniform magnetic field with a constant velocity `vecv = vhati`. The magnetic field is directed along the negative z-axis direction. The induced emf, during the passage of these loops, out of the field region, will not remain constant for ______.


In the given circuit, initially switch S1 is closed and S2 and S3 are open. After charging of capacitor, at t = 0, S1 is open and S2 and S3 are closed. If the relation between inductance capacitance and resistance is L = 4CR2 then the time (in sec) after which current passing through capacitor and inductor will be same is ______ × 10-4 N. (Given R = ℓn(2)mΩ, L = 2mH)


Show that for a given positive ion species in a cyclotron, (i) the radius of their circular path inside a dee is directly proportional to their speed, and (ii) the maximum ion energy achievable is directly proportional to the square of the magnetic induction.


When an electric current is passed through a wire or a coil, a magnetic field is produced. Is the reverse phenomenon possible i.e, can a magnetic field produce an electric current? Explain with the help of an appropriate example.


What happens when the current in a nearby solenoid coil is switched on or off?


Which movement can change the number of magnetic field lines passing through a coil near a solenoid?


Which device used for using electricity developed from Faraday’s and Henry’s experiments?


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×