Download App

4. Moving charges and magnetism — Physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 SciencePhysics4. Moving charges and magnetism1 Mark
MCQ
Two mutually perpendicular conductors carrying currents $I_1$ and $I_2$ lie in one plane. Locus of the point at which the magnetic induction is zero, is a
  • A
    circle with centre as the point of intersection of the conductor.
  • B
    parabola with vertex as the point of intersection of the conductors
  • ✓
    straight line passing through the point of intersection of the conductors.
  • D
    rectangular hyperbola
✓

Answer

Correct option: C.
straight line passing through the point of intersection of the conductors.
c
Magnetic field in $X-Y$ plane at position $(x, y)$ due to both wires must be zero current carrying wire with current i 1 is taken along $X$ axis now the magnetic field at the given point is $B_1=\frac{\mu_0 i_1}{2 \pi y}$

now at the same point the magnetic field due to other wire placed along $Y$ axis is given by

$B_2=\frac{\mu_0 i_2}{2 \pi x}$

now we have to make the magnitude of magnetic field due to both wires same

$B_1=B_2$

$\frac{\mu_0 i_1}{2 \pi y}=\frac{\mu_0 i_2}{2 \pi x}$

now by solving above we have

$y=\frac{i_1}{i_2} x$

so its a straight line with slope $i1/i2$ and passing from origin

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 "M.C.Q (1 Marks)" from 4. Moving charges and magnetism→4. Moving charges and magnetism — all question types→Physics STD 12 Science question papers→CBSE Board STD 12 Science question papers→CBSE Board question paper generator→

Similar questions

The following figure shows a logic gate circuit with two inputs $A$ and $B$ and the output $C.$ The voltage waveforms of $A, B$ and $C$ are as shown below. The logic circuit gate is
→
Three charges $-q, Q$ and $-q$ are placed respectively at equal distances on a straight line. If the potential energy of the system of three charges is zero, then what is the ratio of $Q: q$ ?
→
Which scientist experimentally proved the existence of electromagnetic waves
→
A ray of light travelling in a medium of refractive index $\mu$ is incident at an angle $\theta$ on a composite transparent plate consisting of $50$ plates of $R.I.\,\, 1.01\, \mu , $ $1.02\, \mu ,\, 1.03\, \mu ,$ $ ........ , \,1.50\,\mu $. The ray emerges from the composite plate into a medium of refractive index $1.6\, \mu$ at angle $'x'$. Then :
→
Which of the following waves have a maximum frequency?
→
Einstein got Nobel prize on which of the following works
→
In an experiment of find the focal length of a concave mirror a graph is drawn between the magnitudes of $u$ and $v$. The graph looks like
→
Assertion : A concave mirror and convex lens both have the same focal length in air. When they are submerged in water, they will have same focal length.

Reason : The refractive index of water is smaller than the refractive index of air.

→
A fish looking up through the water sees the outside world contained in a circular horizon. If the refractive index of water is $\frac{4}{3}$ and the fish is $12 \ cm$ below the surface, the radius of this circle in cm is
→
In a transformer 220 ac voltage is increased to 2200 volts. If the number of turns in the secondary are 2000, then the number of turns in the primary will be
→