D.3 Motion in EM fields

A small charge is projected into the electric field shown. What path could the particle take?

• A

• B

• C

• D

The diagram shows a current-carrying conductor in a magnetic field. What is the direction of force?

• Upwards

• Downwards

• Out of the plane

• Into the plane

An electron passes into a region of uniform magnetic field.
Which track shows the possible path of the particle?

• A

• B

• C

• D

The diagram shows the path of a charged particle in a perpendicular magnetic field.
Which of the following statements gives a possible scenario?/

• A negative particle losing energy as it travels from B to A

• A positive particle gaining energy as it travels from A to B

• A positive particle losing energy as it travels from A to B

• A negative particle losing energy as it travels from A to B

The diagram represents an electron travelling into a magnetic field.
Which of the options shown in the second diagram represents a possible path?

• 
• 
• 
• 

A particle of mass m and velocity v travels in a circular path of radius r in a magnetic field of flux density B. What is an expression for the radius of the path?

• r = mv/qB^2
• r = qB/mv
• r = mv/(qB)
• r = B/qv

Two nuclei A and B are projected into a magnetic field as shown in the diagram. What does A have compared to B?

• Same charge and velocity but lower mass.

• Same charge and mass but lower velocity.

• Same mass and velocity but higher charge.

• Same charge and velocity but higher mass.

The diagram shows a conductor moving in a magnetic field.
The electrons in the conductor experience a force.
What is the direction of the force?

• Up

• Left

• Right

• Down

Draw the vector magnetic field strength at point P.
Currents iA and iB have the same magnitude.

Draw the force acting on both current carrying wires.