1. Which group of magnets has attractive forces between all 3 magnets? a. S
NSN
SN
b. SN NS
SN
SN
c. N
SS
-N
NS
d. SN S N
K

What are two different ways you could find the value of a? explain these methods.

3. a particle with initial velocity v⃗ 0=(5.85×103m/s)j^ enters a region of uniform electric and magnetic fields. the magnetic field in the region is b⃗ =−(1.35t)k^. you can ignore the weight of the particle. a. calculate the magnitude of the electric field in the region if the particle is to pass through undeflected, for a particle of charge +0.640 nc.

If a car has a speed of 20 m/s, how long will it take to go 155 m? a. 3100 s b. 135 s c. 2.1 s d. 7.8 s