Question

_{Force and Magnetic Fields III Each diagram below shows the location of one or more wires and three charges labeled A, B, and C. Also shown is the direction of the force exerted on each charge by the magnetic field of the wire or wires. Some of these forces are physically impossible. If a given force is impossible, explain why. If a given force is physically possible, determine the direction in which the charge must be moving. Assume that the direction of each motion is either directly north, south, east, west, into the page, or out of the page. F A I C O B Fis directed into the page B с (+ F is directed into the page F F I B B X + C A А Fis directed out of the page F is directed out of the page I B I B F F с 0 F is directed into the page È is directed into the page}

_{TWO BOTTOM PROBLEMS PLEASE}

Answer 1

Force 'F' on charge 'q' moving with velocity 'v' in magnetic field 'B' is given by

F=q(v x B)

Here, x is cross product of vectors

Direction of magnetic field can be deter mined by right hand thumb rule

Bottom left

At point A

It is possible

Direction of magnetic field is toward left

So if velocity is downward then force on negative charge will be out side the page

At point B

It is not possible

Magnetic field is zero

So at this point no force will be acting

At point C

It is possible

Direction of magnetic field is at some angle ∅ below the horizontal

So if velocity is in direction (90+∅) below the horizontal the force on -ve charge will be into the page

Bottom right

At point A

Direction of magnetic field is upward

So if velocity is toward right then force on positive charge will be out side the page

At point B

It is possible

Magnetic field is upward

So if direction of velocity is into the plane then force on positive charge will be toward right

At point C

It is possible

Direction of magnetic field is at some angle Ø above the horizontal

So if velocity is in direction (90+∅) above the horizontal the force on +ve charge will be into the page