Electricity and Magnetism

Discovered that electric current create magnetic field, which was the first connection found between electricity and magnetism.

• Michael Faraday

• Hans Christian Oersted

• James Clerk Maxwell

• Benjamin Franklin

Answer explanation

Hans brought a compass close to a live electrical wire, and observed that the needle on the compass jumped and pointed to the wire.

What is the flux density in a magnetic field where the flux for 0.1 square meter is 600μWb?

• 0.6mT

• 0.6T

• 6mT

• 60mT

In thermal ohm's law, temperature and power loss are analogous to ____ respectively of ohm's law.

• V and I

• R and V

• I and R

• I and V

The force of attraction or repulsion between two magnetic poles is inversely proportional to the square of the distance between them. This is known as

• Newton's First law

• Faraday's first law of electromagnetic induction

• Coulomb's first law

• Coulomb's second law

The net electrical charge in an isolated system remains constant.

• Law of conservation of charge

• Coulomb's first law

• Coulomb's second law

• Law of conservation of energy

Materials whose permeabilities are slightly greater than that of free space.

• Paramagnetic

• Non-Magnetic

• Ferrromagnetic

• Diamagnetic

Whos discovered the most important electrical effects which is the magnetic effect?

• Hans Christian Oersted

• Sir Charles Wheatstone

• Georg ohm

• James Clerk Maxwell

What is the flux Density of magnetic field whose flux is 3000 uWb and cross-sectional area is 0.25m²?

• 12,000T

• 48,000T

• 0T

• More information is needed

What are the effects of moving a closed wire loop through a magnetic field?

• A voltage is induced in the wire

• A current is induced in the wire

• The polarity across the wire depends on the direction of motion

• All of the above

What is the magnetomotive force in a 150-turn coil of wire 2 A flowing through it?

• 13.33 mAt

• 300 At

• 74 At

• 152 At