+91-87964 74404
FlagBACK
Question icon
Grade 12th passMagnetism

Q. A wire of mass 100gm, length 1m and current 5 ampere is balanced in mid air by a magnetic field B, then find the value of B.

Profile image of Naina Singh
9 Years agoGrade 12th pass
Answers icon

2 Answers

Profile image of Khimraj
9 Years ago
ILB = mg5*1*B =(1/10)10B =1/5 T. Hope it clears. If u have doubt then please ask.Please approve the answer.
Profile image of Shreya D Nanda
9 Years ago
Hi,
As the wire is balanced in mid air, the downward force is equal to the upward force, i.e, the gravitational force is equal to the magnetic force due to the magnetic field B.
Mg=BIL \sin \theta
as B is perpendicular to the current carrying wire, \theta = 90 \Rightarrow sin\theta =1
\therefore Mg= BIL
sustituting the values, in SI units, { g = 9.8m/s2 }
0.1 * 9.8 = B * 5 * 1
B= 0.98/5 T
or B= 0.196 T.
 
hope it is understandable,...
 

Other Related Questions on magnetism

question mark
Four long co-axial thin walled cylindrical conductor A, B, C and D have radii R. 2R 3R and 4R respectively. A and C carry current I and 31 respectively to plane of paper on the other hand, B and D carry and 41 respectively outward to plane of paper. Then 21
magnetism
1 Answer Available

Last Activity: 3 Years ago

question mark
I need solution of these questions.............................Magnetic effect of current
magnetism
1 Answer Available

Last Activity: 4 Years ago

question mark
A freely suspended iron rod does not point at N-S directions alwalys .why
 
 
magnetism
1 Answer Available

Last Activity: 4 Years ago

question mark
What is magnetic entropy change? For my knowledge, I know entropy is randomness or disorder. So here that magnetic refers to the magnetic dipole moments?
magnetism
1 Answer Available

Last Activity: 4 Years ago

question mark
Derive the relation between magnetic field intensity (H) and magnetization (M) for a magnetic material placed in a magnetizing field. 
magnetism
1 Answer Available

Last Activity: 4 Years ago