Download App

Moving Charges and Magnetism — Physics STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 SciencePhysicsMoving Charges and Magnetism1 Mark
MCQ
It two parallel wires carry current in opposite directions:
  • A
    The wires attract each other.
  • B
    The wires repel each other.
  • C
    The wires experience neither attraction nor repulsion.
  • D
    The forces of attraction or repulsion do not depend on current direction.
✓

Answer

  1. The wires repel each other.

Explanation:

If two parallel wires carry current in opposite directions, they repel each other whereas if two parallel wires carry current in same direction, they attract each other.

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 [1M]" from Moving Charges and Magnetism→Moving Charges and Magnetism — all question types→Physics STD 12 Science question papers→Bihar Board STD 12 Science question papers→Bihar Board question paper generator→

Similar questions

Silver and copper voltameter are connected in parallel with a battery of e.m.f. 12 V. In 30 minutes, 1 gm of silver and 1.8 gm of copper are liberated. The power supplied by the battery is ( and

(a) 24.13 J/sec

(b) 2.413 J/sec

(c) 0.2413 J/sec

(d) 2413 J/sec
→

A circular coil of mean radius of 7 cm and having 4000 turns is rotated at the rate of 1800 revolutions per minute in the earth's magnetic field (B = 0.5 gauss), the maximum e.m.f. induced in coil will be

(a) 1.158 V

(b) 0.58 V

(c) 0.29 V           

(d) 5.8 V 
→
Two point charges 10C and -10C are placed at a certain distance. What is the electric potential of their midpoint?
→

A hollow conducting sphere of radius R has a charge (+Q) on its surface. What is the electric potential within the sphere at a distance r =   from its centre

(a) Zero  

(b)  

(c)   

(d) 
→
The dipole moment per unit volume is called as:
→
A circular plate of diameter d is kept in contact with a square plate of edge d as show in figure. The density of the material and the thickness are same everywhere. The centre of mass of the composite system will be:
  1. Inside the circular plate.
  2. Inside the square plate.
  3. At the point of contact.
  4. Outside the system.
→

The binding energy per nucleon of deuterium and helium atom is 1.1 MeV and 7.0 MeV. If two deuterium nuclei fuse to form helium atom, the energy released is

(a) 19.2 MeV

(b) 23.6 MeV

(c) 26.9 MeV

(d) 13.9 MeV
→
Two spheres A and B of exactly same mass are given equal positive and negative charges respectively. Their masses after charging.
→
The work done by the external forces on a system equals the change in:
  1. Total energy.
  2. Kinetic energy.
  3. Potential energy.
  4. None of these.
→
Which of the following has zero average value in a plane electromagnetic wave?
→