- Home
- Standard 12
- Physics
5.Magnetism and Matter
easy
स्पर्शज्या धारामापी से मापते हैं
A
स्थिर धाराएँ
B
धारा आवेग
C
छड़ चुम्बक का चुम्बकीय आघूर्ण
D
पृथ्वी का चुम्बकीय क्षेत्र
Solution
(a) When a current is passed through the galvanomejer coil, then a magnetic fieid $B$ is produced at right angles to the plane of the coil, ie, at right angles to the horizontal component of earth's magnetic field $H.$ Under the influence of two crossed magnetic fields $\mathrm{B}$ and $\mathrm{H}$, the magnetic needle of galvanometer undergoes a deflection $\theta$ which is given by the tangent law. Using tangent law, we can find a relation
$I \propto \tan \theta$
Which clearly indicates that tangent. galvanometer is an instrument used for detection of electric current in a circuit.
Standard 12
Physics