Correct option is D one-ninth the resistance of ammeter
Full scale deflection voltage be V
Now initiall range is I
![\[\mathrm{V}=\mathrm{IR}\]](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-2999f49dff4caeb1362e9d7ac442a909_l3.png "Rendered by QuickLaTeX.com")
Now, Range is made 
![\[\begin{array}{l} \mathrm{V}=10 \mathrm{IR}^{\prime} \\ \mathrm{R}^{\prime}=\mathrm{V} / 10 \mathrm{I}=\mathrm{R} / 10 \end{array}\]](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-97e2f5f7b0afdbc4c3122948915f7d29_l3.png "Rendered by QuickLaTeX.com")
therefore, newR 
of parallel combination will be 
therefore,
![\[\begin{array}{l} 1 / R_{e q}=1 / R+1 / R_{p} \\ 1 / R_{p}=1 / R_{e q}-1 / R=10 / R-1 / R=9 / R \end{array}\]](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-f3e0caf71ae5d08c0b2e8c0ff7ee998b_l3.png "Rendered by QuickLaTeX.com")
therefore, 
option(D)
The resistance required to be connected in parallel to an ammeter in order to increase its range 10 times, will be
A one-tenth the resistance of ammeter
B nine times the resistance of ammeter
C ten times the resistance of ammeter
D one-ninth the resistance of ammeter
A one-tenth the resistance of ammeter
B nine times the resistance of ammeter
C ten times the resistance of ammeter
D one-ninth the resistance of ammeter
The resistance required to be connected in parallel to an ammeter in order to increase its range 10 times, will be
A one-tenth the resistance of ammeter
B nine times the resistance of ammeter
C ten times the resistance of ammeter
D one-ninth the resistance of ammeter
A one-tenth the resistance of ammeter
B nine times the resistance of ammeter
C ten times the resistance of ammeter
D one-ninth the resistance of ammeter
.
)
west of the geographic north. The north tip of the magnetic needle of a dip circle placed in the plane of magnetic meridian points above the horizontal. The horizontal component of the earth’s field is measured to be 
Specify the direction and magnitude of the earth’s field at the location.At a certain location in Africa, a compass points 
and 
carrying currents of 
and 
in the same direction are separated by a distance of 
. Estimate the force on a 
section of wire A.
wire carrying a current of 
is placed inside a solenoid perpendicular to its axis. The magnetic field inside the solenoid is given to be 
. What is the magnetic force on the wire?
and making an angle of 
with the direction of a uniform magnetic field of 
. What is the magnitude of the field 
at a point 
from the wire?
-turns carrying current 
.
is at distance 
from the wire. Find the force acting on the electron if its velocity is directed towards the wire.