Electro-Magnetic Theory

Glass rod when rubbed with silk, takes electrons from the silk. This makes the silk become...

• No charge

• Negatively charged

• Positively charged

Imbalance between negative and positive charges gives rise to...

• Resistance

• Static electricity

• Electric current

• Electric potential

The unit of electric charge is

• Tesla

• Faraday

• Volts

• Coulomb

Magnetic force is a _____ and _____ force.

• non-contact

• contact

• invisible

• visible

A changing​ (a)   field can give rise to ​ (b)  

• magnetic
• current
• Resistance
• electric

Magnets generated due to flow of current are known as...

• Electromagnets

• Magnetic Flux

• Electrodynamics

• Permanent magnet

The magnetism of a permanent magnet is lost forever if we ______ it.

• play with

• heat

• break

What are the variables in solenoid?

• Number of turns of the coil

• Amount of current through the wire

• Core material inside the solenoid

• Surrounding gas

Electromotive force is a

• Force exerted due to electric and magnetic fields

• Force exerted due to electric field only

• Force exerted due to the motion of an electron

• Force exerted due to the motion of the magnet

In Fleming's left-hand rule, index finger indicates the direction of

• Magnetic field

• Current

• Thrust

• Motion