Answer:
Yes it is true because static friction help us to make grip between the foot and the ground surface
Explanation:
Yes, as we know that the friction between two surface is of two types
1) Static friction
2) Kinetic friction
When two surface moves relative to each other then the friction force between two surface is kinetic friction and it always opposes the relative motion of two rough surface
While when one surface has tendency to move with respect to its contact surface but if it can not move on it then in this case it is static friction
So relative motion is not possible in this type of friction
So static friction helps to prevent slipping
Answer:
The hill is a total of 150 meters tall
Explanation:
30×5=150
The flux will be 4 times stronger ( due to the inverse square law )
Answer:
We can increase the strength by increasing current in the wire or increasing the number of turns of the coil around an iron core .
Explanation:
The magnetic strength due to current carrying conductor carrying current I and having N number of turns is given by
B = 
is vacuum permeability .and its value is equal to 
.so from the above equation we can see that magnetic strength is directly proportional to the current through wire and no. of turns .
