magnetism

Question 1

property of B

Answer 1

1. continuos closed loop
2. tangent at any point gives direction
3. no two magnetic field lines intersect
4. the no. density of B at any point gives intensity of magnetic field
5. in uniform magnetic field, B is parallel. equispaced and straight

Question 2

magnetic dipole

Answer 2

arrangement of 2 equal and opposite magnets separated by small distance

Question 3

magnetic dipole moment
SI
MATHEMATICAL REP
SCALAR OR VECTOR
DIRECTION

Answer 3

M= m 2l
J/T
vector
south to north

Question 4

current loop as magnetic dipole

si unit
direction

Answer 4

M = N I A
Am^2
North pole - anti
south pole - clock wise

Question 5

define A/m^2

Answer 5

magnetic moment of 1 turn of loop of area 1 m^2 carrying current 1A

Question 6

what happens to magnetic moment and pole strenght when
1. magnet is cut longitudenally
2. magnet is cut transversely

Answer 6

1. a. magnetic moment - half
   b. pole stregnght is - halved
2. a. magnetic moment - half
   b. poles stregnht is same

Question 7

what is magnetic dipole moment with respect ot torque

Answer 7

magnetic dipole moment is th etorque acting on a dipole held perpe to B of 1 strength

Question 8

magnetisation or intensity of magnetisation (I)
unit

Answer 8

the magnetic moment per unit volume
I = M/V
unit- A/m
pole strength per unit area of cross sec

Question 9

magnetic intensity (H)
unit
⛲🚿🔩🔗🐝🐝

Answer 9

no. of ampere turns flowing around unit length of toroidal solenoid to produce the magnetic induction B, in the solenoid
B = μo n I
B = μo H
H= μo/B

Question 10

MAGNETIC SUSCEBILITY (Xm)
unit:

DONT BE NAIVE

Answer 10

THE ratio of intensity of magnetisation to magnetic intensity
Xm = I/H

Question 11

MAGNETIC PERM
μ
UNIT:

Answer 11

RATIO of magnetic induction to th emagnetic intensity
μ = B/H
Tm/A

Question 12

DIA MAGNETIC
1. SUS
2. RELATIVE PERM
3. AT OR REP
4. DENSITY OF M.F
5. EXAMPLES
6. NET DIPOLE

Answer 12

1. -1<X <0
2. 0<μ<1 and μr = X+1and μ <μ o
3. IN non uniform M.F they move from strong to weak
4. m.f less dense inside
5. cu, N2, H20, NaCl, Pb
6. IS 0

Question 13

PARA MAGNETIC
1. SUS
2. RELATIVE PERM
3. AT OR REP
4. DENSITY OF M.F
5. EXAMPLES
6. NET DIPOLE

Answer 13

1. 0< X<ε
2. 1<μ <1+ε andμ >μ o
3. in non uniform M.F they move from weak to strong
4. M.F denser inside
5. 02, Al, Ca, Na
6. is non zero

Question 14

FERRO MAGNETIC
1. SUS
2. RELATIVE PERM
3. AT OR REP
4. DENSITY OF M.F
5.NET DIPOLE

Answer 14

1. X»1
2. μ&raquo_space;1 and μ&raquo_space;μ 0
3. in non uniformM.F they attract strongly
4. NET DIPOLE IS NON 0

Question 15

PERMENANT MAGNETS
and examples

Answer 15

magnetisation persists
Al, Ni, Co

Question 16

soft ferro magnets

Answer 16

magnetisation disappear
soft iron