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 = 0.50T
The 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

Question

srikanth vadagam · Answer

α
I
∴
=
NBA
k
Current sensitivity of M 2
N B A / k N 2 B2 A2 42 × 0.50 × 1.8 × 10−3
= 2 2 2
=
=
= 1.4
Current sensitivity of M 1
N1 B1 A1 / k
N1 B1 A1
30 × 0.25 × 3.6 × 10−3
Voltage sensitivity
α
V
=
α
IR
=
NBA
kR
Voltage sensitivity of M 2 N 2 B2 A2 / kR2 N 2 B2 A2 R1 7 10
=
=
×
= × =1
Voltage sensitivity of M 1
N1 B1 A1 / kR1
N1 B1 A1 R2 5 14

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