Physics chapter 19 important questions for Fsc Students Lahore board

 Define Magnetic Field.

Answer: Magnetic field wo region hai jahan magnetic force kisi magnetic material ya moving charge par act karta hai.

State the direction of magnetic field around a current-carrying conductor.

Answer: Right-hand thumb rule ke mutabiq: Thumb current ki direction me rakho, fingers magnetic field ki direction dikhaengi.

What is Electromagnetism?

Answer: Electromagnetism wo phenomenon hai jisme current se magnetic field produce hota hai aur magnet ka effect paida hota hai.

Define Solenoid.

Answer: Solenoid ek coil of wire hai jisme current flow karne par magnetic field create hota hai.

Applications of Electromagnet.

Answer:

Electric bell

Crane for lifting metals

MRI machines

What is Fleming’s Left-Hand Rule?

Answer: Ye rule motor effect me force ki direction determine karta hai:

Thumb → Motion

First finger → Magnetic field

Second finger → Current

What is Magnetic Flux?

Answer: Magnetic flux = total magnetic field passing through a surface

Define Faraday’s Law of Electromagnetic Induction.

Answer: Faraday law kehta hai:

Induced EMF in a coil = rate of change of magnetic flux through the coil.

What is Lenz’s Law?

Answer: Lenz’s Law kehta hai:

Induced current ka direction hamesha aise hota hai jo magnetic flux ke change ko oppose kare.

Difference between AC and DC.

Answer:

AC (Alternating Current): Current ki direction time ke sath bar bar change hoti hai

DC (Direct Current): Current ek hi direction me flow karti hai

What is Electromagnetic Induction used for?

Answer:

Electric generators

Transformers

Induction cookers

What is Magnetic Force on a Moving Charge?

Answer:

Define Torque on a Current Loop in a Magnetic Field.

Answer: Torque = tendency of current loop to rotate in a magnetic field

What is Magnetic Moment?

Answer: Magnetic moment = strength and orientation of a magnet

State Right-Hand Grip Rule.

Answer: Fingers curl in the direction of current in coil, thumb points in magnetic north direction. thumb points in magnetic north direction.

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