As we know that magnetic field strength due to solenoid is given by
here we know that
= permeability of air medium
N = number of turns
L = length of solenoid
i = electric current
Now as we enter the iron rod into the solenoid the medium will get change that will increase the permeability
so with the iron rod we will have
so correct answer will be
<u>It increases the magnetic field’s strength. </u>
Answer:
It will move a distance of 4 * 3.5 = 4 cm in one cycle.
zero to max A, back to zero, zero to min A, back to zero (4 * A)
Answer:
Options A and B.
Explanation:
Gravitational acceleration, initial height, intial speed and time are required to determine final speed. The option D is incorrect, since speed varies in time. Option C is dimentionally wrong.
The correct strategy is calculating the initial height from option B. Later, substituting time in equation A to derive an expression of the final velocity in terms of position. Hence, the required equations are options A and B.
Lower the resistance to sliding.
Answer:
The bicycle slows down because of the frictional force acting on the tyres of the bicycle. When this frictional force overcomes the force applied by paddling, the bicycle stops.
