1. If the force of charge A on charge B is +5 N, what is the force if charge B i

Question

1. If the force of charge A on charge B is +5 N, what is the force if charge B is replaced by a body with the same charge as B and half the mass of B?

a) +5 N

b) +5/4 N

c) +5/2 N

d) 10 N

2. When you are listening to a radio, the sound coming from the radio is

a) electromagnetic wave that travels far more slowly than 300,000 km/s

b) not an electromagnetic wave of any kind, and travels far more slowly than 300,000 km/s

c) electromagnetic wave traveling at 300,000 km/s

d) some kind of unknown wave

3. If we put an electron and a neutron 1m apart in a vacuum, the main force between them is the ____ force. (can be more than 1 answer)

a) electic

b) weak

c) gravitational

d) strong

e) restoring

4. Magnetic fields act on (can be more than 1 answer)

a) flowing charges, like an electric current

b) uncharged particles, like neutrons

c) stationary postively charged things, like protons

d) stationary negatively charged things, like electrons

5. Fill in the blank - If we put an electron and a proton 1m apart in a vacuum, the two main forces between them are the ___ and ___.

a) gravitational

b) electric

c) strong

d) restoring

e) magnetic

6. From question 5, if we replace the proton with another electron, the magnitude (not direction) of the electric force will become

a) smaller but not much

b) much larger

c) stay the same

d) much smaller

e) larger but not much

Explanation / Answer

1.a 5N ,electromagnetic force depends on charge,gravitational force is very less compared to electromagnetic force,so it need not be taken into account

2.c) electromagnetic wave traveling at 300,000 km/s

3.b)weak c)gravitaional,because neutron has 0 charge so no electric force

4.a) flowing charges, like an electric current F=I(l x B)....

F=Q(V X B) but since velcity of charged particles are 0 ,they are stationary,so force is 0 so no c,d

5.b)electric and d)restoring

6.c) stay the same

;charge is same so magnitude same,only direction will change

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