(iv) Birth canal
(a) Draw the pattern of magnetic field lines through and around a current carrying
circular loop of wire. Mark the direction of electric current in the loop and magnetic
field lines.
(b) On what factors does the strength of magnetic field due to circular loop depends
and how?
(c) State and define the rule used to find the direction of magnetic field lines due to
current through a circular loop.
chlorine is passed over slaked lime at 313 K?
Answers
(iv)=>>>>>>..
birth canal...
The manner in which the child passes through the birth canal in the second stage of labour depends upon the position in which it is lying and the shape of the mother’s pelvis. The sequence of events described in the following paragraphs is that which frequently occurs when the mother’s pelvis is of the usual type and the child is lying with the top of its head lowermost and transversely placed and the back of its head (occiput) directed toward the left side of the mother (see onset of labour in the figure). The top of the head, accordingly, is leading, and its long axis lies transversely.
Further descent of the head directly downward in the direction in which it has been traveling is opposed by the lower portion of the mother’s bony pelvis, behind, and the resisting soft parts that are interposed between it and the opening of the vagina (see internal rotation of head in the figure). Less resistance, on the other hand, is offered by the soft and dilatable walls of the lower birth canal, which is directed forward and upward. The back of the child’s head accordingly advances along the lower birth canal, distending its walls and dilating its cavity while the head progresses. Soon the back of the child’s neck becomes impinged against the bones of the pelvis, in front, and the chin is forced farther and farther away from the breastbone. Thus, as extension (bending of the head backward) takes the place of flexion, the occiput, brow, eye sockets, nose, mouth, and chin pass successively through the external opening of the lower birth canal and are born (see extension in the figure).
The neck, which was twisted during internal rotation of the head, untwists as soon as the head is born. Almost immediately after its birth, therefore, the top of the head is turned toward the left and backward.
As the child’s lower shoulder advances, it meets the sloping resistance of the pelvic floor on the right side and is shunted forward and to the left toward the middle of the pelvis in front. This position brings the long diameter of the shoulder circumference into relation with the anteroposterior, or long diameter, of the pelvic cavity. Because of this internal rotation of the shoulders, the top of the head undergoes further external rotation backward and to the left so that the child’s face comes to look directly at the inner aspect of the mother’s right thigh (see external rotation of head in the figure).
Soon after the shoulders rotate, the one in front appears in the vulvovaginal orifice and remains in this position while the other shoulder is swept forward by a lateral bending of the trunk through the same upward and forward curve that was followed by the head as it was being born. After this shoulder is delivered, the shoulder in front and the rest of the child’s body are expelled almost immediately and without any special mechanism.
An average of about one hour and 45 minutes is required for the completion of the second stage of labour in women who give birth for the first time. In subsequent labours the average duration of the stage of expulsion is somewhat shorter.
●□●□●□●□●□●□●□●□●□●□●□
a]=>>>>>.
The diagram is as shown in the figure. The direction of the current is from M to N. The direction of the magnetic field created due to this current carrying loop is also shown. The direction of the magnetic field is got by using Right Hand Thumb Rule at each point of the loop considering the direction of the electric current. This rule states that:
Imagine that you are holding a current-carrying straight conductor in your right hand such that the thumb points towards the direction of current. Then your fingers will wrap around the conductor in the direction of the field lines of the magnetic field.
The iron filings will be arranged in the direction of the magnetic field as shown.
see the image .
○●○●○●○●○●○□○●○●○●○●○●○
b]=>>>>.
The magnitude of magnetic field produced by a current carrying circular loop depends upon: The current passing through the circular loop-directly proportional. The radius of circular loop-inversely proportional. Number of turns of the wire in the circular loop-directly proportional.
▪•▪•▪•▪•▪•▪•▪•▪•▪•▪•▪•▪•▪
c]=>>>>>.
As evident from the figure, the magnetic field lines will be less denser in the region near the circumference of the loop than at the center. Thus, the magnetic field will be stronger at the center of the loop than in the region near the circumference.
see the image.
MY DEAR FRIEND PLEASE THANKS MY 15 ANSWERS ☺☺
Answer:
The muscular canal that goes from the uterus to the outside of the body. During birth, the baby passes through the birth canal. Also called vagina.