1.Mention the ways of producing induced emf?

• By changing the magnetic field B 
• By changing the area A of the coil and
• By changing the relative orientation θ of the coil with magnetic field.

2.State Fleming’s right hand rule?

The thumb, index finger and middle finger of right hand are stretched out in mutually perpendicular directions.

If the index finger points the direction of the magnetic field and the thumb indicates the direction of motion of the conductor, then the middle finger will indicate the direction of the induced current.

3.State lenz law?

Lenz’s law states that the direction of the induced current is such that it always opposes the cause responsible for its production.

4.Define Q-factor?

It is defined as the ratio of voltage across L or C at resonance to the applied voltage.

5.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 I_RMS . For alternating voltages, the RMS value is given by V_RMS .

6.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.

7.What are advantages and disadvantages of AC over DC?

Advantages:

• The generation of AC is cheaper than that of DC.
• When AC is supplied at higher voltages, the transmission losses are small compared to DC transmission.
• AC can easily be converted into DC with the help of rectifiers.

Disadvantage :

• Alternating voltages cannot be used for certain applications such as charging of batteries, electroplating, electric traction etc.
• At high voltages, it is more dangerous to work with AC than DC.