Electromagnetic induction

What is the SI unit of magnetic flux?

• Volt
• Weber
• Tesla
• Farad
• Joule

Faraday's law relates to which of the following?

• Electric current and flux
• Magnetic field and current
• Voltage, current, and flux
• Voltage and magnetic flux
• None of these

What is the cause of electromagnetic induction?

• Changing electric field
• Constant magnetic field
• Changing magnetic field
• Constant electric field
• Both A and C

In a transformer, if the primary coil has more turns than the secondary coil, what happens to the voltage?

• Increases
• Decreases
• Remains the same
• Doubles
• Triples

The direction of induced current is given by which law?

• Ampere's law
• Coulomb's law
• Lenz's law
• Ohm's law
• Faraday's law

In a generator, mechanical energy is converted into which type of energy?

• Mechanical energy
• Thermal energy
• Nuclear energy
• Electrical energy
• Solar energy

What type of core material is used in transformers to decrease losses?

• Air
• Copper
• Iron
• Silver
• Steel

What is the effect of electromagnetic induction in a conductor?

• Creates a magnetic field
• Creates an electric field
• Generates current
• Generates voltage
• Both C and D

The phenomenon of self-induction occurs in a single coil. This effect is related to which of the following?

• Mutual inductance
• Self-inductance
• Both A and B
• Neither A nor B
• None of these

If the rate of change of magnetic flux is zero, what will be the induced electromotive force?

• Zero
• Constant
• Negative
• Positive
• None of these