If number of turns in moving coil galvanometer becomes half , then the deflection for the same current will become
A
half
B
same
C
double
D
4 times
Text Solution
Verified by Experts
The correct Answer is:
A
`I prop theta thetefore I = K theta` and `I_g prop theta' therefore I_g= Ktheta'` `therefore (I_g)/(I)=(theta)/(theta)` But `I_(g)=((S)/(S+G))I` `therefore (((S)/(S+G))I)/(I)=(theta)/(theta)therefore (S)/(S+G)=(theta)/(theta)` `therefore (40)/(40+G)=(theta)/(2theta) therefore G=40 Omega`
Topper's Solved these Questions
MAGNETIC EFFECT OF ELECTRIC CURRENT
NIKITA PUBLICATION|Exercise MCQs (Sensitivity and accuracy of M.C.G.)|1 Videos
KINETIC THEORY OF GASES & RADIATION
NIKITA PUBLICATION|Exercise MCQs (Question Given in MHT-CET)|79 Videos
MAGNETISM
NIKITA PUBLICATION|Exercise MCQs|249 Videos
Similar Questions
Explore conceptually related problems
The deflection in a moving coil galvanometer is
A galvanometer coil is replaced by another coil of diameter one-fourth of the original diameter and the total number of turns as ten times the original number. What will be the new deflection if the same current is passed through it?
If in a moving coil galvanometer, a current I produces a deflection theta , then
A galvanometer coil is replaced by another coil of diameter one-fourth of the original diameter and the total number of turns as ten times the original number. What will be the new diflection if the same current is passed through it? Old deflection is theta .
In a moving coil galvanometer, the deflection of the coil q is related to the electrical current i by the relation
NIKITA PUBLICATION-MAGNETIC EFFECT OF ELECTRIC CURRENT-MCQs (Sensitivity and accuracy of M.C.G.)
