A. a line vertical to the flux lines
B. the mean length of a ring shaped coil
C. a line of magnetic flux in a non-uniform field
D. a line of magnetic flux which does not follow the designed path
Related Mcqs:
- The working of a meter is based on the use of a permanent magnet. In order to protect the meter functioning from stray magnetic fields______________?
A. meter is surrounded by strong magnetic fields
B. a soft iron shielding is used
C. a plastic shielding is provided
D. a shielding of anon-magnetic material is used - The materials are a bit inferior conductors of magnetic flux than air
A. ferromagnetic
B. paramagnetic
C. diamagnetic
D. dielectric - A 200 turn coil having an axial length of 30 mm and a radius of 10 mm is pivoted in a magnetic field having a flux density of 0.8 T. If the coil carries a current of 0.5 A, the torque acting on the coil will be_____________?
A. 8 N-m
B. 0.48 N-m
C. 0.048 N-m
D. 0.0048 N-m - A 300 mm long conductor is carrying a current of 10 A and is situated at right angles to a magnetic field having a flux density of 0.8 T ; the force on the conductor will be____________?
A. 240 N
B. 24 N
C. 2.4 N
D. 0.24 N - Which of the following is the unit of magnetic flux density ?
A. weber
B. lumens
C. tesla
D. none of the above - A material which is slightly repelled by a magnetic field is known as_____________?
A. ferromagnetic material
B. diamagnetic material
C. paramagnetic material
D. conducting material - How does the magnetic compass needle behave in a magnetic field ?
A. It assures a position right angle to magnetic field
B. It starts rotating
C. It assures a position which follows a line of magnetic flux
D. None of the above - What will be the magnetic potential difference across the air gap of 2 cm length in magnetic field of 200 AT/m ?
A. 2 AT
B. 4 AT
C. 6 AT
D. 10 AT - A rectangular magnet of magnetic moment M is cut into two piece of same length, the magnetic moment of each piece will be______________?
A. M
B. M/2
C. 2 M
D. M/4 - If a copper disc is rotated rapidly below a freely suspended magnetic needle, the magnetic needle shall start rotating with a velocity?
A. less than that of disc but in opposite direction
B. equal to that of disc and in the same direction
C. equal to that of disc and in the opposite direction
D. less than that of disc and in the same direction
