Loading DoubtNut Solution for you. Solution : Dead beat galvanometer is one in which the coil comes to rest at once after the passage of current through it. The deflection can be noted in no time. NCERT alternative academic calendar for classes 11 and 12 released. CBSE has released criteria for applying the change in the board exam centre. Exams will be conducted from 18 to 30 July for class 12, and 29 to 30 July for class 10 students.

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Given, a square loop. What if K is closed? How much power is required when K is open? What is the source of this power? When key is closed, the excess charge is maintained by the continuous flow of current. The motion of rod will not cut across the lines of magnetic field and hence no e. Chapter Chosen Electromagnetic Induction. Book Chosen Physics Part I. Subject Chosen Physics. Book Store Download books and chapters from book store.

Currently only available for. Class 10 Class Electromagnetic Induction. Why the coil of a dead beat galvanometer is wound on a metal frame? The coil of a dead beat galvanometer is wound on a metal because, the eddy currents will quickly bring the coil to rest.

Eddy currents are linked with bulk pieces of conductor subjected to change in magnetic flux. Eddy currents can be minimised by using laminations of metal to make a metal core. Switch Flag Bookmark. The field is neither uniform in space nor constant in time. Determine the direction and magnitude of the induced current in the loop if its resistance is 4. A rectangular wire loop of sides 8 cm and 2 cm with a small cut is moving out of a region of uniform magnetic field of magnitude 0. For how long does the induced voltage last in each case?

Figure shows a metal rod PQ resting on the smooth rails AB and positioned between the poles of a permanent magnet. The rails, the rod, and the magnetic field are in three mutual perpendicular directions. A galvanometer G connects the rails through a switch K. Assume the field to be uniform. Give the polarity and magnitude of the induced emf. It is desired to measure the magnitude of field between the poles of a powerful loud speaker magnet.

The total charge flown in the coil measured by a ballistic galvanometer connected to coil is 7. The combined resistance of the coil and the galvanometer is 0. Estimate the field strength of magnet. A circular coil of radius 8. Obtain the maximum and average e. Calculate the average power loss due to Joule heating. Where does this power come from? The average e. An external source is responsible for the supply of energy for this torque. So we can say that source of this power is the external rotor.

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Electromagnetic Induction


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