Colder in Alaska, warmer in Mexico.
Answer:
1.False
2.4 E
Explanation:
1.We have to find the statement is true or false.
We know that
Time constant,
Time constant is inversely proportional to resistance R .It means when R increases then time constant decreases when R decrease then the time constant decreases.
Statement:The larger the value of R ,the longer it takes the circuit to reach its final steady- state value
It is false.
2.Energy stored in inductor,E=
When I'=2I
Then, 
Hence,the new total energy will become 4 E.
Answer:
16.26 cm in front of the mirror
Explanation:
Using,
1/f = 1/u+1/v....................... Equation 1
Where f = focal focal length of the concave mirror, u = object distance, v = image distance.
make v the subject of the equation
v = fu/(u-f)................... Equation 2
Note: The focal length of a concave mirror is positive
Using the real- is- positive convention
Given: f = 22/2 = 11 cm, u = 34 cm.
Substitute into equation 2
v = (34×11)/(34-11)
v = 374/23
v = 16.26 cm.
The image will be formed 16.26 cm in front of the mirror.
Answer:
4.5 meters
Explanation:
3 meters to his friend's house. +3
Halfway back. +1.5
3+1.5
=4.5
4.5 meters in total
Answer: a) 278 * 10^-12 F and 19.4 * 10^-9 C
b) 17.44 * 10^3 N/C and c) C=k*C0 and V=70/k
Explanation: In order to solve this problem we have to use the expression of the capacitor of parallel plates as:
C=A*ε0/d where A is the area of the plates and d the distance between them
C=Π r^2*ε0/d
C=π*0.2^2*8.85*10^-12/0.004=278 * 10^-12F= 278 pF
then
ΔV= Q/C
so Q= ΔV*C=70V*278 pF=19.4 nC
The electric field between the plates is given by:
E= Q/(A*ε0)=19.4 nC/(π*0.2^2*8.85*10^-12)=17.44 *10^3 N/C
If it is introduced a dielectric between the plates, then the new C is increased a factor k while the potential between the plates decreases a factor 1/k.
