Question

2]
A bar magnet of magnetic moment 5A- m² has poles 20 cm apart its pole strength is
a) 50 A- m
b) 15 A-m
) 25 A-m
d) 45 A-m​

Answer 1

$\huge\bf\red{\underline{\underline{ANSWER:-}}}$

magnetic moment (μ) = 5 A-m²

distance of pole (d) = 20 cm = 0.2 m

We know -

Magnetic moment = distance × pole strength

μ = d × pole strength

5 = 0.2 × pole strength

5 × 5 = 0.2 × 5 × pole strength

25 = 1 × pole strength

pole strength = 25 A-m