Alternating Current Test

Result

Alternating Current Test - 7

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Question 1
1 / -0

Transformer uses the follwing principle of

A
charge conservation

B
induction

C
least action

D
conduction

Solution

A transformer consists of two electrically isolated coils. It works on the principle of mutual induction of two coils or Faraday Law’s Of Electromagnetic induction. When current in the primary coil is changed the flux linked to the secondary coil also changes.hence an EMF is induced in the secondary coil due to Faraday law’s of electromagnetic induction.
Question 2
1 / -0

A light bulb and an open coil inductor are connected to an ac source . If an iron rod is inserted into the interior of the inductor then

A
The bulb glows on and off

B
The bulb glows dimmer

C
The bulb glow is unaffected

D
The bulb glows brighter

Solution

As the iron rod is inserted, the magnetic field inside the coil magnetizes the iron increasing the magnetic field inside it. Hence, the inductance of the coil increases. Consequently, the inductive reactance of the coil increases. As a result, a larger fraction of the applied ac voltage appears across the inductor, leaving less voltage across the bulb. Therefore, the glow of the light bulb decreases.