- #1
paulfr
- 193
- 3
IB High Level Physics Test Question
I have encountered a question whose answer I disagree with.
I think the answer is I and II , not the I and III on the answer sheet.
What do you think ?
=================
A positively charged rod R is suspended by insulating string.
When a stationary rod S is placed nearby, rod R is attracted towards it.
Consider the following statements regarding the possible nature of the rod S.
I. Rod S is charged.
II. Rod S is an uncharged insulator.
III. Rod S is an uncharged conductor.
Which statement(s) can explain the attraction of rod R to rod S?
A. I only
B. II only
C. III only
D. I and III only
=====================
Clearly a negatively charged Rod S can attract Rod R.
So "I" is ok.
But the conductor can not maintain the induced charge differential
needed to attract Rod R since any charge concentration / voltage
will cause a current eliminating charge build up.
However, an insulator can maintain an induced charge differential.
Did the International Bacalaureate HL Test writers get it wrong
or am I missing something ?
Thanks
I have encountered a question whose answer I disagree with.
I think the answer is I and II , not the I and III on the answer sheet.
What do you think ?
=================
A positively charged rod R is suspended by insulating string.
When a stationary rod S is placed nearby, rod R is attracted towards it.
Consider the following statements regarding the possible nature of the rod S.
I. Rod S is charged.
II. Rod S is an uncharged insulator.
III. Rod S is an uncharged conductor.
Which statement(s) can explain the attraction of rod R to rod S?
A. I only
B. II only
C. III only
D. I and III only
=====================
Clearly a negatively charged Rod S can attract Rod R.
So "I" is ok.
But the conductor can not maintain the induced charge differential
needed to attract Rod R since any charge concentration / voltage
will cause a current eliminating charge build up.
However, an insulator can maintain an induced charge differential.
Did the International Bacalaureate HL Test writers get it wrong
or am I missing something ?
Thanks