Back to ELECTRO MAGNETIC INDUCTION

NEET UG PHYSICS MCQ: ELECTRO MAGNETIC INDUCTION

1 Medium

1 of 1

Application +4 | -1

An axle of truck is

\mathrm{2}\mathrm{.5 m}

long. If the truck is moving due north at

30\,\,m{s^{( - 1)}}

at a place where the vertical component of the earth’s magnetic field is

90\,\,\mu T

, the potential difference between the two ends of the axle is

View answer and explanation

Correct option: A

\mathrm{6}.\mathrm{75}\,\,\mathrm{mV}

with west end positive

Option A (

\mathrm{6}.\mathrm{75}\,\mathrm{mV}

with west end positive) is correct because the motional EMF is calculated using

\varepsilon = vBL

, and the direction is determined by the right-hand rule.

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: 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. 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 