Current Electricity and Electrical InstrumentHard
Question
A galvanometer coil has a resistance 90W and full scale deflection correct 10mA. A 910W resistance is connected in series with the galvanometer to make a voltmeter. If the least voltmeter is 0.1V, the number of divisions in its scales is
Options
A.30
B.91
C.100
D.None
Solution
Rv = 
- G ⇒ 910 = 
- 90
⇒ V = 10 ⇒ No. of divisions =
= 100
- G ⇒ 910 = - 90⇒ V = 10 ⇒ No. of divisions =
= 100Create a free account to view solution
View Solution FreeTopic: Current Electricity and Electrical Instrument·Practice all Current Electricity and Electrical Instrument questions
More Current Electricity and Electrical Instrument Questions
A cell having an emf ε and internal resistance r is connected across a variable external resistanceR. As the resist...The drift velocity of electrons in a conducting wire is of the order of 1mm/s, yet the bulb glows very quickly after the...The electrochemical equivalent of a metal is 3.3 × 10-7 kg per coulomb. The mass of the metal liberated at the cath...In the circuit shown below. The reading of the voltmeter V is : -...In the circuit shown below, the cell has an e.m.f. of 10 V and internal resistance of 1 WΩ. The other resistances a...