Electromagnetic Induction

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What is the purpose of eddy currents induced in the aluminium frame of a moving coil galvanometer?

To improve the galvanometer's accuracy

To increase the coil's resistance

To enhance the sensitivity of the galvanometer

To damp the oscillation about the final steady position (correct)

What is the principle behind electric brakes?

Eddy currents opposing motion (correct)

Thermal braking

Frictional braking

Electromagnetic induction

Why is a solid core used in an induction furnace?

To increase the furnace's efficiency

To maximize heat generation (correct)

To reduce eddy currents

To minimize heat generation

What is the purpose of laminating the core in some applications?

To minimize eddy currents Signup and view all the answers

What type of galvanometer is characterized by the absence of oscillations?

Dead-beat galvanometer Signup and view all the answers

What is the direction of the magnetic field when the wheel rotates in a horizontal plane?

BV Signup and view all the answers

What is the net emf of the wheel in terms of the number of spokes N?

e net is independent of N Signup and view all the answers

What is the emf of a single metal spoke in the wheel?

e DYG Signup and view all the answers

What is the purpose of the conducting wheel in the given figure?

To convert mechanical energy into electrical energy Signup and view all the answers

What is the relationship between the angular velocity ω and the frequency ν of the wheel?

ω = 2πν Signup and view all the answers

What is the application of eddy currents in medical treatment?

Diathermy Signup and view all the answers

What is the principle behind the braking effect in energy meters?

Electromagnetic damping Signup and view all the answers

What is the purpose of the split ring commutators in a DC motor?

To reverse the current in the coil Signup and view all the answers

What is the effect of back emf on a DC motor?

It decreases the torque Signup and view all the answers

What is the type of coil used in a DC motor to reduce eddy current losses?

Laminated core coil Signup and view all the answers

What is the primary reason for using a laminated core design in some applications?

To reduce eddy current losses Signup and view all the answers

What is the principle behind electromagnetic damping in energy meters?

Lenz's law Signup and view all the answers

What is the purpose of dead-beat galvanometers?

To eliminate oscillations in measurements Signup and view all the answers

What is the application of eddy currents in electric brakes?

To convert kinetic energy into heat energy Signup and view all the answers

What is the effect of back emf on a DC motor?

It opposes the rotation of the motor Signup and view all the answers

What is the primary reason for using a light aluminium frame in a moving coil galvanometer?

To minimize eddy current losses Signup and view all the answers

What is the primary function of eddy currents in electric brakes?

To oppose the motion of the wheels and bring the train to a stop Signup and view all the answers

What is the advantage of using a laminated core in certain applications?

To minimize eddy current losses and heat generation Signup and view all the answers

What is the characteristic of a dead-beat galvanometer?

It has a critical damping, resulting in minimal oscillations Signup and view all the answers

In an induction furnace, what is the purpose of using a solid core?

To maximize heat generation and reduce the size of the furnace Signup and view all the answers

What is the primary purpose of laminating the core in some applications?

To reduce the energy losses due to eddy currents Signup and view all the answers

What is the characteristic feature of a dead-beat galvanometer?

It has an absence of oscillations Signup and view all the answers

What is the primary purpose of using a laminated core in an electric brake?

To reduce the energy losses due to eddy currents Signup and view all the answers

What is the principle behind the electromagnetic damping effect?

Eddy currents induce an opposing force on the wheel Signup and view all the answers

What is the primary purpose of using a copper disc in a Faraday copper disc generator?

To reduce the eddy current losses Signup and view all the answers

Electromagnetic Induction

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Questions and Answers

What is the purpose of eddy currents induced in the aluminium frame of a moving coil galvanometer?

What is the principle behind electric brakes?

Why is a solid core used in an induction furnace?

What is the purpose of laminating the core in some applications?

What type of galvanometer is characterized by the absence of oscillations?

What is the direction of the magnetic field when the wheel rotates in a horizontal plane?

What is the net emf of the wheel in terms of the number of spokes N?

What is the emf of a single metal spoke in the wheel?

What is the purpose of the conducting wheel in the given figure?

What is the relationship between the angular velocity ω and the frequency ν of the wheel?

What is the application of eddy currents in medical treatment?

What is the principle behind the braking effect in energy meters?

What is the purpose of the split ring commutators in a DC motor?

What is the effect of back emf on a DC motor?

What is the type of coil used in a DC motor to reduce eddy current losses?

What is the primary reason for using a laminated core design in some applications?

What is the principle behind electromagnetic damping in energy meters?

What is the purpose of dead-beat galvanometers?

What is the application of eddy currents in electric brakes?

What is the effect of back emf on a DC motor?

What is the primary reason for using a light aluminium frame in a moving coil galvanometer?

What is the primary function of eddy currents in electric brakes?

What is the advantage of using a laminated core in certain applications?

What is the characteristic of a dead-beat galvanometer?

In an induction furnace, what is the purpose of using a solid core?

What is the primary purpose of laminating the core in some applications?

What is the characteristic feature of a dead-beat galvanometer?

What is the primary purpose of using a laminated core in an electric brake?

What is the principle behind the electromagnetic damping effect?

What is the primary purpose of using a copper disc in a Faraday copper disc generator?

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