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51. Choose the medium most suitable for the core of electromagnets (NTSE Chandigarh, Stage-I, 2015-16)
Air
Wood
Soft iron
Steel
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52. The essential difference between AC generator and DC generator is (NTSE Panjab, Stage-I, 2016-17)
DC generator will generate a higher voltage
AC generator will generate a higher voltage
AC generator has slip rings while DC generator has a commutator
AC generator has electric magnet where as DC generator has permanent magnet
53. Phenomenon of electromagnetic induction is (NTSE Chandigarh, Stage-I, 2016-17)
Process of charging a body
Process of generating magnetic field due to a current passing through a coil
Producing induced current in a coil due to relative motion between a magnet and the coil
Process of rotating a coil of an electric motor
54. A long straight wire carries 5 A current. Find the magnetic field induction produced at a radial distance of 5 cm from its axis. (Here μ0 = 4π x 10-7 N/A2) (NTSE Odisha, Stage-I, 2016-17)
0.1 x 10-4 Tesla
0.3 x 10-5 Tesla
0.2 x 10-4 Tesla
0.5 x 10-4 Tesla
55. The strength of a magnetic field of magnet increases when (NTSE Chhattisgarh, Stage-I, 2016-17)
The number of magnetic lines of forces passing through a given area increases
Strength of the pole increases
Distance between the magnetic pole increases
Both (1) and (2)
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