SaraNextGen Study App [2022-23]
Last Updated On 23-10-2022 - By Sara

A bar magnet is demagnetized by inserting it inside a solenoid of length 0.2.m, 100 turns, and carrying a current of 5.2A.  The coercivity of the bar magnet is:

a.

1200A\m

b.

2600A/m

c.

520A/jm

d.

285A/m


Question ID - 50042 :-

A bar magnet is demagnetized by inserting it inside a solenoid of length 0.2.m, 100 turns, and carrying a current of 5.2A.  The coercivity of the bar magnet is:

a.

1200A\m

b.

2600A/m

c.

520A/jm

d.

285A/m

1 Answer
5876 Votes
3537

Answer Key : (b) -

Coercivity=H=

=ni= 5.2

= 2600A/m.



Next Question :

A rod of length L at room temperature and uniform area of cross section.  A, is made of a metal having coefficient of linear expansion /0C.  It is observed that an external compressive force f, is applied on each of its ends, prevents any change in the length of the rod.  When its temperature rises by T K, young’s modulus, Y for this metal is:

a.

 

b.

 

c.

 

d.

 


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