A short bar magnet of magnetic moment `20Am^(2)` has a cross sectional area of `1.5xx10^(-4)m^(2)`. If the intensity of magnetisation of the magnet is

B) increases

Correct option is  D) doubled

i. The bar magnet said to have pole strength +qm and -qm near the north and south poles respectively. ii. As bar magnet has two poles with equal and opposite pole strength, it is...

Given: m = 5.0 Am2, 2l = 20 cm = 0.20 m To find: Pole strength (qm) Formula: qm = \(\frac{m}{2l}\) Calculation: From formula. qm = \(\frac{5.0}{0.20}\) = 25 Am

Given: m = 3.6 Am2, qm = 10.8 Am To find: i. Magnetic length  ii. Geometric length Formulae: i. Magnetic length = \(\frac{m}{q_m}\) ii. Geometric length = \(\frac{6}{5}\) × magnetic length. Calculation: From formula (i), Magnetic length = \(\frac{3.6}{10.8}\) = 0.33 m From formula (ii), Geometric length...

Given: m = 0.48 JT-1, r = 10 cm = 0.1 m To find: i. Magnetic induction along axis (Ba) ii. Magnetic induction along equator (Beq) Formulae: i. Ba = \(\frac{\mu_0}{4\pi}\,\frac{2m}{r^3}\) ii. Ba = 2 Beq Calculation: From formula (i), Ba = 10-7 × \(\frac{2\times0.48}{10^{-3}}\) ∴...

When bar magnet is cut into two equal parts, then magnetic moment of each part becomes half of the original directed from S to N pole. ∴ Magnetic moment of the combination...

Correct option is: (C) 10

Correct Answer - A Both, the assertion and reason are true and the latter is correct explanation of the former.

Correct Answer - 9 9