Analog voltmeters and ammeters work b measuring the torque exerted by a megentic field on a current carrying coil. The reading is displayed by means of the deflection of a pointer over a scale. The adjacent figure shows the essentials of a galvanometer, on which both analog ammters and analog voltmeters are based. Assume that the coil is 2.1 cm high, 1.2 cm wide has 250 turns and is mounted so that it can rotate about an axis (into the page) in a uniform radial magnetic field with B = 0.23 T. for any orientation of the coil, the net magnetic field through the coil is perpendicular to the normal vector of the coil (and thus parallel to the plane of coil) A spring S_(P) provides a counter torque that balance the magnetic torque so that a given steady current I in the coil results in a steady angular diflection phi. The greater the current is greater the deflection is and thus greater the torque required of the spring is A current of 100 muA produces an angular deflection of 28^(@). If the value ofmagnetic field is put equal to 0.69 T and K= 15.6 xx 10^(-8) nm/degree. Then the deflection would be