Question

Current sensitivity of a moving coil galvanometer

Answer 1

Answer:

Current sensitivity of a moving coil galvanometer is 55 div/mA and its voltage sensitivity (angular deflection per unit voltage applied) is 2020 div/V. The resistance of the galvanometer is?

Asked on October 15, 2019 byavatar

Pandi Sethi

ANSWER

Current sensitivity

I_g=\dfrac{NBA}{K}=\dfrac{5div}{mA}=5000\displaystyle\frac{div}{A}I

g

=

K

NBA

=

mA

5div

=5000

A

div

Voltage sensitivity v_s=\dfrac{NBA}{KR}=20\dfrac{div}{v}v

s

=

KR

NBA

=20

v

div

\Rightarrow\displaystyle\frac{I_g}{v_s}=R⇒

v

s

I

g

=R

\Rightarrow R=\displaystyle\frac{5000}{20}=250\Omega⇒R=

20

5000

=250Ω

Option 1 is correct.

Explanation:

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Answer 2

Current sensitivity of a galvanometer:

*It is defined as the deflection producedwhen unit current passes through the galvanometer.

*A galvanometer is said to be sensitive if it produces large deflection for a small current.