Let x be the time in minutes that it will take to bake the regular - sized loaf. With this representation, the time it will take for the mini - loaf is 0.5x + 5.
0.5x + 5 = 25
The value of x from the equation is 40. Thus, it will take 40 minutes to bake the regular-sized loaf.
The magnetic force on the electron is:

where q is the electron charge, v the electron speed, B the magnetic field intensity and

is the angle between v and B. Since the electron is traveling perpendicular to the magnetic field,

, so we can write

This force acts as centripetal force of the motion,

, where m is the electron mass and r the radius of the circular orbit. So we can write:

and by re-arranging this equation, we find the radius of the circular orbit, r:
Answer:
Explanation:
a)
Using Ohms Law

Where J is the current density 
and the direction of E is the same as the direction of the current. Since J is uniform throughout the conductor
just inside at a radius a (and anywhere else).
b)
Since we have no changing electric fields we can use Ampere’s law in it’s simplest form without displacement current

such that

and by the right hand rule, since the current is going to the right, the magnetic field is circling around the conductor such that it’s pointing out of the page at the top and into the page at the bottom.
c)
The Poynting vector is given by

and by the right hand rule it’s always pointing in towards the center of the conductor.
d)
Note: directions of these three vectors are mentioned along with their magnitudes in above 3 parts a , b and c
Here we will the speed of seagull which is v = 9 m/s
this is the speed of seagull when there is no effect of wind on it
now in part a)
if effect of wind is in opposite direction then it travels 6 km in 20 min
so the average speed is given by the ratio of total distance and total time


now since effect of wind is in opposite direction then we can say



Part b)
now if bird travels in the same direction of wind then we will have


now we can find the time to go back



Part c)
Total time of round trip when wind is present


now when there is no wind total time is given by


So due to wind time will be more
Here is the main thing is medium. In the free boundary wave face the air medium, but in a fixed boundary wave face different medium. The change of medium effect on the change of the reflection of wave.