physics _ Electromagnetism -Abbas

What happens when current passes through a conductor?

• It gains resistance
• It produces a magnetic field
• It becomes positively charged
• It starts rotating

Ampere’s Law relates magnetic field to:

• Electric voltage
• Magnetic flux
• Electric current
• Electric field

Magnetic field lines around a straight current-carrying wire are:

• Straight lines
• Elliptical
• Concentric circles
• Radial lines

Right-hand rule is used to find:

• Current direction
• Magnetic field direction
• Voltage
• Resistance

Unit of magnetic field strength (B) is:

• Tesla
• Weber
• Ampere
• Henry

What is the symbol of magnetic flux?

• B
• Φ
• μ
• T

SI unit of magnetic flux is:

• Tesla
• Weber
• Henry
• Volt

Which rule determines the direction of induced current?

• Left-hand rule
• Right-hand rule
• Lenz’s law
• Ohm’s law

Lenz’s law is based on the law of:

• Magnetism
• Energy conservation
• Electrostatics
• Work-energy

According to Faraday

• Induced current opposes change
• Magnetic field is constant
• EMF is produced by changing flux
• Current is maximum in closed loop