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D e a r S t u d e n t, G i v e n, M a g n e t i c f i e l d, B = 700 G θ = 30 ° T o r q u e a c t i n g, T = 0.014 N m S i n c e T o r q u e a c t i n g o n m a g n e t i s g i v e n b y : T = M B \sin θ ∴ M = \frac{T}{B \sin θ} \Rightarrow M = \frac{0.014}{700 * 10^{- 4} * \sin 30 °} M = 0.4 A - m^{2} T h i s i s r e q u i r e d m a g n e t i c m o m e n t . W o r k d o n e b y t h e e x t e r n a l f o r c e t o m o v e t h e m a g n e t f r o m s t a b l e t o u n s t a b l e p o s i t i o n i s g i v e n b y, W = - M B [\cos θ_{2} - c o s θ_{1}] W = - M B (- 1 - 1) = 2 M B W = 2 \times 0.4 \times 700 \times 10^{- 4} = 0.048 J R e g a r d s

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