Download App

Magnetic Effect of Current — JEE physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceJEE physicsMagnetic Effect of Current1 Mark
MCQ
A moving coil galvanometer has $150$ equal divisions. Its current sensitivity is $10$ divisions per milliampere and voltage sensitivity is $2$ divisions per millivolt. In order that each division reads $1\, volt$, the resistance in $ohms$ needed to be connected in series with the coil will be
  • A
    $99995$
  • B
    $9995$
  • C
    ${10^3}$
  • D
    ${10^5}$
✓

Answer

Voltage sensitivity $ = \frac{{{\rm{Current \,sensitivity}}}}{{{\rm{Resistance\, of \,galvanometer}}\,{\rm{G}}}}$

$ \Rightarrow $   $G = \frac{{10}}{2} = 5\,\Omega $.

Here ${i_g} = $ Full scale deflection current $ = \frac{{150}}{{10}} = 15\,mA$.

$V =$ Voltage to be measured $= 150 × 1 = 150 \,V.$

Hence $R = \frac{V}{{{i_g}}} - G = \frac{{150}}{{15 \times {{10}^{ - 3}}}} - 5 = 9995\,\Omega $.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "MCQ" from Magnetic Effect of Current→Magnetic Effect of Current — all question types→JEE physics STD 12 Science question papers→CBSE Board STD 12 Science question papers→CBSE Board question paper generator→

Similar questions

A particle of mass $m$ is attached to a spring (of spring constant $k$ ) and has a natural angular frequency $\omega_0$-An external force $F(t)$ proportional to $\cos \omega t\left(\left(\omega \neq \omega_0\right)\right.$ is applied to the oscillator. The time displacement of the oscillator will be proportional to
→
The volume of an ideal gas is 1 litre and its pressure is equal to $72 \mathrm{~cm}$ of mercury column. The volume of gas is made $900 \mathrm{~cm}$ by compressing it isothermally. The stress of the gas will be
→
The angle of minimum deviation measured with a prism is $30^{\circ}$ and the angle of prism is $60^{\circ}$. The refractive index of prism material is
→
The sensitiveness of a moving coil galvanometer can be increased by decreasing
→
A microammeter has a resistance of $100\,\Omega $ and full scale range of $50\,\mu A$. It can be used as a voltmeter or as a higher range ammeter provided a resistance is added to it. Pick the correct range and resistance combination
→
A coil carrying electric current is placed in uniform magnetic field, then
→
Photo cells are used for the
→
The point representing the cut off grid voltage on the mutual characteristic of triode is
Image
→
A man measures the period of a simple pendulum inside a stationary lift and finds it to be $T$ sec. If the lift accelerates upwards with an acceleration $g / 4$, then the period of the pendulum will be
Image
→
An energy source will supply a constant current into the load if its internal resistance is
→