NEET UG PHYSICS MCQ: ELECTRO MAGNETIC INDUCTION

1 Medium

1 of 1

Understanding +4 | -1

Consider the statements:
(I)If magnetic field,

\mathrm{B = 0}

, then magnetic flux is also zero.
(II)If magnetic flux,

\phi = 0,

then magnetic field is also zero.

View answer and explanation

Correct option: A

(I)is true , (II) may be true

Option A ((I)is true , (II) may be true) is correct because if the magnetic field is zero, the magnetic flux is also zero. However, if the magnetic flux is zero, the magnetic field may or may not be zero.

More Questions from ELECTRO MAGNETIC INDUCTION

Practice All Chapter MCQs →

Assertion (A): Whenever the magnetic flux linked with a closed coil changes there will be an induced emf as well as an induced current.

Reason (R): According to Faraday, the induced emf is inversely proportional to the rate of change of magnetic flux linked with a coil. The coefficient of mutual inductance of two coils is

6\,\,mH

. If the current flowing in one is

2\,\,ampere

, then the induced e.m.f. in the second coil will be The induced emf cannot be produced by: The coefficient of self inductance of a solenoid is 0.18 mH. If a rod of soft iron of relative permeability 900 is inserted, then the coefficient of self inductance (in mH ) will become nearly: A uniformly wound solenoidal coil of self inductance

1.8 \times {10^{ - 4}}

H and resistance 6 Ω is broken up into two identical coils. These identical coils are then connected in parallel across a 12 V battery of negligible resistance. The time constant of the current in the circuit  An electric motor runs a DC source of emf

200\,\,V

and draws a current of

10\,\,A

. If the efficiency is

40\,\,\%

, then the resistance of the armature is