Chapter 4 : Electromagnetic Induction and Alternating Current – Important 2 Mark Questions
Most Repeated 2 Mark Questions
Curated from Previous Year Question Papers
Mention the ways of producing induced emf.
The ways of producing induced emf are:
State Fleming’s right hand rule.
The thumb, index finger and middle finger of the right hand are stretched out in mutually perpendicular directions.
If the index finger points in the direction of the magnetic field and the thumb indicates the direction of motion of the conductor, then the middle finger indicates the direction of the induced current.
State Lenz’s law.
Lenz’s law states that the direction of the induced current is such that it always opposes the cause responsible for its production .
Define Q-factor.
It is defined as the ratio of voltage across L or C at resonance to the applied voltage .
What are the advantages and disadvantages of AC over DC?
Advantages:
Disadvantage:
What is meant by wattless current?
The current in an AC circuit is said to be wattless current if the power consumed by it is zero .
Appeared Once Questions
Curated from Previous Year Question Papers
Define RMS value of an alternating current.
The root mean square value of an alternating current is defined as the square root of the mean of the squares of all currents over one cycle .
It is denoted by IRMS. For alternating voltages, the RMS value is given by VRMS.
of squared wave Base length of one cycle
