Electromagnetic induction

Faraday's law says the induced emf is proportional to the:

• 1 Magnetic flux
• 2 Rate of change of magnetic flux
• 3 Area only
• 4 Resistance

Lenz's law is a consequence of conservation of:

• 1 Momentum only
• 2 Energy
• 3 Charge
• 4 Mass

A coil has 100 turns and the flux through each turn changes by 0.02 Wb in 0.1 s. The average emf is:

• 1 0.2 V
• 2 200 V
• 3 2 V
• 4 20 V

The SI unit of inductance is the:

• 1 Tesla
• 2 Henry
• 3 Farad
• 4 Weber

Energy stored in an inductor L carrying current I is:

• 1 L I²
• 2 1/2 L I
• 3 1/2 L I²
• 4 L I

Self induction depends on the:

• 1 Voltage only
• 2 Colour of the wire
• 3 Shape and number of turns of the coil
• 4 Temperature only

A generator produces an emf by:

• 1 Heating a wire
• 2 Reflecting light
• 3 Rotating a coil in a magnetic field
• 4 Charging a capacitor

The unit of mutual inductance is the:

• 1 Tesla
• 2 Henry
• 3 Ohm
• 4 Farad