Basics of Magnetic Fields Quiz_Sayali Kanhav

Which of the following statements is true about magnetic field lines?

• They originate from the south pole and end at the north pole.

• They always form open loops.

• They originate from the north pole and end at the south pole.

• They intersect each other.

The SI unit of magnetic field strength (magnetic flux density) is:

• Tesla

• Newton

• Ampere

• Coulomb

A charged particle moving perpendicular to a uniform magnetic field experiences a force that:

• Increases its speed

• Changes its mass

• Changes its direction only

• Stops its motion

The direction of magnetic force on a moving positive charge is given by:

• Fleming's left-hand rule

• Fleming's right-hand rule

• Right-hand rule (cross product of velocity and magnetic field)

• Lenz's law

A proton enters a uniform magnetic field perpendicular to its velocity. The path followed is:

• Straight line

• Circular

• Parabolic

• Spiral

If a particle moves parallel to a magnetic field, the magnetic force on it is:

• Maximum

• Zero

• Constant

• Infinite

The magnetic force F⃗ on a charged particle is given by:

• F⃗=qv⃗⋅B⃗

• F⃗=qE⃗

• F⃗=qv⃗×B⃗

• F⃗=ma⃗

The radius rr of the circular path of a charged particle moving in a magnetic field is directly proportional to:

• Charge of the particle

• Mass of the particle

• Magnetic field strength

• Speed of light

An electron and a proton enter the same magnetic field at the same speed and angle. Which of the following is true?

• They follow identical circular paths.

• They curve in opposite directions.

• The electron moves straight, the proton curves.

• Only the proton is affected by the magnetic field.

A charged particle moves in a helical path in a magnetic field. This happens when:

• The velocity is perpendicular to the field.

• The velocity is parallel to the field.

• The velocity has components both parallel and perpendicular to the field.

• The particle is neutral.