Physics II Lab w answers_Part_19

Physics II Lab w answers_Part_19 - 49 The integral I =...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 49 The integral I = & & L x ) x ( B x d x d can be evaluated to give, [ ] 2 2 2 m d L d d B I- + =------------------------------- (15) I.5. Determination of B m : The value of B m is determined from the period of oscillation of the magnetometer needle. The magnetometer is placed at the center in place of CRT so that the magnets are at a distance of d from it (see fig4). The magnetometer needle aligns itself along the resultant magnetic field fig 4 2 m 2 E B B B + = where B E is the earths magnetic field acting towards south . A small disturbance of the needle about the equilibrium position causes it to oscillate. The angular frequency of small oscillations can be easily shown to be (Exercise 7) I B = , where & is the magnetic moment of the needle and I its moment of inertia, and hence the time period of small oscillations B I 2 T = . Now, the resultant magnetic field m 2 m 2 E sin / B B B B = + = . Thus 2 2 m T Sin I 4 B = In the absence of the magnets B=B...
View Full Document

Page1 / 2

Physics II Lab w answers_Part_19 - 49 The integral I =...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online