The resistance of a galvanometer is $50\,\Omega $ and current required to give full scale deflection is $100\,μA$ in order to convert it into an ammeter for reading upto $10\,A$. It is necessary to put an resistance of
  • A$3.5\times 10^{-4}\,\Omega $
  • B$10\times 10^{-4}\,\Omega $
  • C$2.5\times 10^{-4}\,\Omega $
  • D$5\times 10^{-4}\,\Omega $
AIIMS 2010, Medium
art

Download our app
and get started for free

Experience the future of education. Simply download our apps or reach out to us for more information. Let's shape the future of learning together!No signup needed.*

Similar Questions

  • 1
    The acceleration of an electron at a moment in a magentic field $\vec B\, = \,2\hat i + 3\hat j + 4\hat k$ is $\vec a\, = \,x\hat i - 2\hat j + \hat k$. The value of $x$ is
    View Solution
  • 2
    A long copper tube of inner radius $R$ carries a current $i$. The magnetic field $B$ inside the tube is
    View Solution
  • 3
    A moving coil galvanometer has resistance $50\,\Omega $ and it indicates full deflection at $4\,mA$ current. A voltmeter is made using this galvanometer and a $5\,k\Omega $ resistance. The maximum voltage, that can be measured using this voltamenter, will be close to ......$V$
    View Solution
  • 4
    A hairpin like shape as shown in figure is made by bending a long current carrying wire. What is the magnitude of a magnetic field at point $P$ which lies on the centre of the semicircle ?
    View Solution
  • 5
    Bohr magneton is given by (symbols have their usual meanings)
    View Solution
  • 6
    Which particles will have minimum frequency of revolution when projected with the same velocity perpendicular to a magnetic field
    View Solution
  • 7
    Two charged particles, having same kinetic energy, are allowed to pass through a uniform magnetic field perpendicular to the direction of motion. If the ratio of radii of their circular paths is $6: 5$ and their respective masses ratio is $9: 4$. Then, the ratio of their charges will be.
    View Solution
  • 8
    Heart-lung machines and artifical kidney machines employ blood pumps. A mechanical pump can mangle blood cells.Figure represents an electromagnetic pump. The blood is confined to an electrically insulating tube, represented as a rectangle of width $\omega$ and height $h.$ Two electrodes fit into the top and the bottom of the tube. The potential difference between them establishes an electric current through the blood, with current density $J$ over a section of length $L.$ A perpendicular magnetic field exists in the same region. The section of liquid in the magnetic field experiences a pressure increase given by :-
    View Solution
  • 9
    A thin, straight conductor lies along the axis of a hollow conductor of radius $R$. The two carry equal currents in the same direction. The magnetic field $B$ is plotted against the distance $r$ from the axis. Which of the following best represents the resulting curve?
    View Solution
  • 10
    A straight section $PQ$ of a circuit lies along the $X$-axis from $x = - \frac{a}{2}$ to $x = \frac{a}{2}$ and carries a steady current $i$. The magnetic field due to the section $PQ$ at a point $X = + a$ will be
    View Solution