A bar magnet has total length 2 l=20 units and the field point P is at a distance d =10 units from the centre of the magnet. If the relative uncertainty of length measurement is 1 % , then uncertainty of the magnetic field at point P is :

Question

Quantrex Academy · Accepted Answer

Correct answer: A. 4 %

Magnetic field at P, B= ₀ 4 m(2 l) r^3 , where m is the pole strength aligned ( B B 100 ) & = ( l l ) 100+3 | r r | 100 & =1 %+3 %=4 % aligned

A bar magnet has total length 2 l=20 units and the field point P is at a distance d =10 units from the centre of the magnet. If the relative uncertainty of length measurement is 1 % , then uncertainty of the magnetic field at point P is :

Options

Correct answer

Step-by-step solution

More from Magnetic Properties of Matter