RBSE Class 12 Physics Chapter 8 Very Short Question bank

 

RBSE Class 12 Physics Chapter 8 Very Short Answer Type Questions

Question 1.

An attractive needle which is allowed to turn in an upward plane in the event that set at geomagnetic south or north pole, in which bearing it pivots?

Reply:

Free attractive needle in vertical plane generally show in vertical up or down.

Question 2.

Name the attractive substance whose nature doesn't change by changing the ordinary temperature.

Reply:

The attractive conduct of diamagnetic substance doesn't change by changing the ordinary temperature.

Question 3.

On going from central line towards shaft what will be the adjustment of point of plunge?

Reply:

On going from attractive central line towards shafts, the point of plunge increments from 0° to 90°. On attractive central line plunge point is 0° and at shafts it will be 90°.

Question 4.

The attractive powerlessness of substance is - 0.085. What sort of substance this is?

Reply:

Diamagnetic substance. Since for diamagnetic substance, attractive vulnerability is negative and less all of the time than.

Question 5.

Characterize retentivity.

Reply:

The attractive acceptance left behind in the example after the polarizing field has been eliminated is called remaining attraction or rententity.

Question 6.

Give two instances of paramagnetic substances.

Reply:

(I) CuCl2 (ii) Oxygen.

Question 7.

What is attractive meridian?

Reply:

The upward plane going through the attractive pivot of a uninhibitedly suspended little magnet is called attractive meridian. The world's attractive field acts toward the attractive meridian.

Question 8.

The points of plunge at two puts on the outer layer of the earth are separately 0° and 90°, where are these spots found?

Reply:

On attractive central line point of plunge is 0° and at post, point of plunge is 90°.

Question 9.

Compose a connection between attractive porousness of a medium and attractive defenselessness.

Reply:

μr = (1 + Xm)

μr - attractive porousness

Xm - attractive defenselessness

Question 10.

Compose unit of attractive post strength.

Reply:

The unit of attractive post strength is (A-m).

Question 11.
The vertical component of earth’s magnetic field at a place is V3 times the horizontal component. What is the value of angle of dip at this place?

Reply:

Question 12.

What is attractive hysteresis?

Reply:

The peculiarity of the falling of attractive acceptance behind the charging field when an example of attractive material is exposed to a pattern of polarization is called hysteresis.

Question 13.

What will be the proportion in the upsides of attractive field because of a bar magnet at hub and tropical situations from mid mark of bar magnet?

Reply:

Attractive field in hub line

Question 14.

What will be the worth of point of 4ip where level and vertical part of earth are equivalent?

Reply:

BH = BV (given)

tanθ = BV/BH = 1

tanθ = tan45°

Question 15.

Assuming a bar magnet is cut along its length in two equivalent parts, then, at that point, what will be the adjustment of attractive snapshot of the magnet?

Reply:

Attractive Moment of a Bar Magnet

Attractive snapshot of a bar attractive is characterized as the result of shaft strength of post and the partition between shafts. Assuming the shaft strength is view as m and dipole length is l then, at that point, :

M = m × l

The bearing of M is from S shaft to N post.

It a bar magnet cut transitionally