AP EAMCET202017 Sep 2020Evening ShiftPhysicsMagnetic Properties of MatterActual
The deflection produced in a tangent galvanometer, whose coil has a resistance of (9 ) is (30^ ). The potential difference across the coil is (4.5 ~V ). If the number of turns in the coil is 10 , the radius of the coil is (Given, (B_ H =3.14 10⁻⁵ ~T ) )
Options
- A(2 3 10⁻² ~m )
- B(10 3 10⁻² ~m )
- C(6 10⁻² ~m )
- D(3.5 10⁻² ~m )
Correct answer
B. (10 3 10⁻² ~m )
Step-by-step solution
For tangent galvanometer, Deflection, ( =30^ ) Resistance of coil, (R=9 ) Potential difference across coil, (V=4.5 ~V ) Number of turns in the coil ( aligned N & =10 B_H & =3.14 10⁻⁵ ~T aligned ) Current flowing through the coil, (I= V R = 4.5 9 =0.5 ~A ) We know that, current flowing through the galvanometer is given as ( aligned I & = 2 r B_H ₀ N r & = ₀ N I 2 B_H & = 4 10⁻⁷ 10 0.5 2 3.14 10⁻⁵ 30^ & =10 3 10⁻² ~m aligned )