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Two moving coil meters have the following particulars:R1 = 10 Ω , N 1 = 30, A1 = 3.6 × 10−3 m 2 , B1 = 0.25T R2 = 10 Ω , N 2 = 42, A2 = 1.8 × 10−3 m 2 , B2 = 0.50TThe spring constants are identical for the two meters. Determine the ratio of(i) Current sensitivity and (ii) Voltage Sensitivity of M 2 and M1 .Current Sensitivity
αI∴=NBAkCurrent sensitivity of M 2N B A / k N 2 B2 A2 42 × 0.50 × 1.8 × 10−3= 2 2 2=== 1.4Current sensitivity of M 1N1 B1 A1 / kN1 B1 A130 × 0.25 × 3.6 × 10−3Voltage sensitivityαV=αIR=NBAkRVoltage sensitivity of M 2 N 2 B2 A2 / kR2 N 2 B2 A2 R1 7 10==×= × =1Voltage sensitivity of M 1N1 B1 A1 / kR1N1 B1 A1 R2 5 14
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