Answered

Which of the following actions cannot induce voltage in a wire?

Amoving a coil of wire near a magnet

Bmoving a magnet near a coil of wire

Cchanging a current in a nearby coil of wire

Dchanging the magnetic field around the coil of wire

Emoving a wire parallel to a magnetic field

Verified Answer :

Answer : The correct option is, E.

Explanation :

Induced voltage : According to Faraday's Law the induced voltage in a coil is directly proportional to the number of turns in the coil and to the rate at which magnetic field is changing.

Formula for induced voltage :

\(e=N\frac{d\phi}{dt}\)

where,

e = induced voltage

N = number of turns in a coil

\(\phi\) = magnetic flux

t = time

Magnetic flux : Magnetic flux is measure the magnetic field within a closed area.

Formula used for magnetic flux :

\(\phi=BAcos\theta\)

where,

B = magnetic field

A = area

\(\theta\) = angle between the magnetic field and the area of loop

Only option (E) can not induced voltage in a wire because when moving a wire parallel to a magnetic field then the \(\theta\) will be zero, so \(cos\theta\) will become 1. Hence, the flux becomes constant.

As, the flux is a constant value for this, so, the induced voltage becomes 0 because \(\frac{d\phi }{dt}=0\). So, it will not induced voltage.

lilyanmaynard

Answer:

For plato users: Option E.

Explanation:

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