Q6. What can you say about the particles that make it through the plates undefle

Question

Q6. What can you say about the particles that make it through the plates undeflected (i.e., go in a straight line)? Does the sign of the charge of the particles play a role in whether or not the particles make it through? Q7. What determines where the particle lands on the screen (i.c, what radius r does the particle make)? Q8. If the strengths of the fields are set in the experiment, what information can you determine about the particle? You have two bar magnets- the left one is fixed in place and the right one can rotate freely around a fixed axis at its center. NS| 09. What way will the magnet begin to rotate? 010. Why won't this work as a motor? What's the advantage of a current loop that a permanent bar magnet doesn't have?

Explanation / Answer

13. for the clockwise rotation of the coil form the view,

theta is decreasing and then increasing with time

so formthe figure, the direction of flux change changes when theta crosses 0 deg mark

hence we have to flip the direciton of i at theta = 0 deg

14. again, the torque will change direction when theta crosses +180 deg mark( along the direction of magnetic field)

hence, at theta = 180 deg the direction of current has to be reversed again

15. if we never flip the current

the maximum angle at which the loop begins to rotate back again is theta

then from conservation of energy

integral(i*A*B*sin(theta)*d(theta)) = 0

hence from symetry

the wire loop will move to a maximum angle of thetaa n the opposite direction of the magnetic field

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