Question

If the strength of the magnetic field at A is 10 units, the strength of the magnetic field at B is _____. 640 units 6.4 units 2.5 units 1.25 units NEXT

Answer 1

Answer:

2.5 units

Explanation:

Answer 2

Answer : Option C) 2.5 units

Explanation : For calculating the strength of a unknown magnetic field in comparison with the given magnetic field we can use the magnetic formula as;

$\frac{ S_{1}}{S_{2}} = \frac{ (D_{1}^{2}) }{(D_{2}^{2})} .$

On substituting the values we get; 

$\frac{10}{x} = \frac{4^{2}}{2^{2}}$ ;

On solving we get the magnetic B field strength as 2.5 units