Question
Question: A ferromagnetic substance of volume 10<sup>–3</sup>m<sup>3</sup> is placed in an alternating field o...
A ferromagnetic substance of volume 10–3m3 is placed in an alternating field of 50 Hz. Area of hysteresis curve obtained is 0.1 M.K.S. unit. The heat produced due to energy loss per second in the substance will be
A
5 J
B
) 5 × 10–2cal
C
1.19 × 10–3cal
D
) No loss of energy
Answer
1.19 × 10–3cal
Explanation
Solution
By using heat loss = VAnt ; whre V = volume = 10–3 m3;
A = Area = 0.1m2, n = frequency = 50 Hz and t = time = 1sec
Heat loss = 10–3 × 0.1 × 50 × 1 = 5 × 10–3 J = 1.19 × 10–3 cal