Download App

Moving Charges and Magnetism — Physics STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsMoving Charges and Magnetism1 Mark
MCQ
A steady electric current is flowing through a cylindrical conductor.
  • A
    The electric field at the axis of the conductor is zero.
  • B
    The magnetic field at the axis of the conductor is zero.
  • C
    The electric field in the vicinity of the conductor is zero.
  • D
    The magnetic field in the vicinity of the conductor is zero.
✓

Answer

  1. The magnetic field at the axis of the conductor is zero.
  2. The electric field in the vicinity of the conductor is zero.

Explanation:

As the current is flowing through a conductor so it it is distributed only on the surface of the conductor not in the volume of the cylindrical conductor. It is equivalent to charge distribution on a cylindrical sheet for which electric field inside a conducting cylindrical sheet is always zero.

Magnetic fields at any point inside the conducting cylinder is proportional to the distance from the axis of the cylinder.

At the axis, r = 0.

This implies that field will be zero at the axis.

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 Moving Charges and Magnetism→Moving Charges and Magnetism — all question types→Physics STD 12 Science question papers→Gujarat Board STD 12 Science question papers→Gujarat Board question paper generator→

Similar questions

Let $\overrightarrow{\text{A}}$ be a unit vector along the axis of rotation of a purely rotating body and $\overrightarrow{\text{B}}$ be a unit vector along the velocity of a particle P of the body away from the axis. The value of $\overrightarrow{\text{A}}.\overrightarrow{\text{B}}$ is:
  1. 1
  2. -1
  3. 0
  4. None of these.
→

The radius of curvature for a convex lens is 40 cm, for each surface. Its refractive index is 1.5. The focal length will be

(a) 40 cm

(b) 20 cm

(c) 80 cm

(d) 30 cm
→

A plano-convex lens when silvered in the plane side behaves like a concave mirror of focal length 30cm. However, when silvered on the convex side it behaves like a concave mirror of focal length 10 cm. Then the refractive index of its material will be

(a) 3.0

(b) 2.0

(c) 2.5

(d) 1.5
→

Assertion  :   An electric field is preferred in comparison to magnetic field for detecting the electron beam in a television picture tube.

Reason      :  Electric field require low voltage.

(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.

(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.

(c) If assertion is true but reason is false.

(d) If the assertion and reason both are false.
→
The pressure exerted by an electromagnetic wave of intensity I$\Big(\frac{\text{watt}}{\text{m}^2}\Big)$ on a non-reflecting surface is : [c is the velocity of light].
→

The resultant magnetic moment of neon atom will be

(a) Infinity

(b) mB

(c) Zero  

(d) mB/2
→

A bar magnet when placed at an angle of 30o to the direction of magnetic field induction of 5 × 10–2 T, experiences a moment of couple 25 × 10–6 N-m. If the length of the magnet is 5 cm its pole strength is

(a) 2 × 10–2 A-m

(b) 5 × 10–2 A-m

(c) 2 A-m

(d) 5 A-m
→

A proton and a deutron both having the same kinetic energy, enter perpendicularly into a uniform magnetic field B. For motion of proton and deutron on circular path of radius   and   respectively, the correct statement is

(a)  

(b)  

(c)  

(d)  
→

The angle of polarisation for any medium is 60o, what will be critical angle for this

(a)  

 (b)  

(c)  

(d)  
→

In Young's double slit experiment the y-coordinates of central maxima and 10th maxima are 2 cm and 5 cm respectively. When the YDSE apparatus is immersed in a liquid of refractive index 1.5 the corresponding y-coordinates will be

(a) 2 cm, 7.5 cm

(b) 3 cm, 6 cm

(c) 2 cm, 4 cm

(d) 4/3 cm, 10/3 cm
→