AP EAMCET202421 May 2024Evening ShiftPhysicsMagnetic Properties of MatterActual
At a place the horizontal component of earth's magnetic field is 3 10⁻⁵ ~T and the magnetic declination is 30^ . A compass needle of magnetic moment 18 Am ^2 pointing towards geographic north at this place experiences a torque of
Options
- A36 10⁻⁵ Nm
- B18 10⁻⁵ Nm
- C54 10⁻⁵ Nm
- D27 10⁻⁵ Nm
Correct answer
D. 27 10⁻⁵ Nm
Step-by-step solution
B _ H =3 10⁻⁵ ~T , =30^ , M =18 Am ^2 Torque, = MB _ H =18 3 10⁻⁵ 30^ =27 10⁻⁵ Nm