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Byju's Answer

Standard XII

Physics

Analysis of Force Equation

An electric f...

Question

An electric field $E$ and a magnetic field $B$ act over the same region in which an electron enters along the x-axis. The combination of $E$ and $B$ which permits the electron to go undeflected is:

E

along

Y -

axis and

B

along

Y -

axis

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E

along

Y -

axis and

B

along

Z -

axis

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E

along

X -

axis and

B

along

Z -

axis

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E

along

Y -

axis and

B

along

X -

axis

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Solution

The correct option is B $E$ along $Y -$ axis and $B$ along $Z -$ axis
[B] gives a possible combination
$_{E} = e E (-^j), \to E = E^j$
$_{B} = e v B (^j), \to B = B^k$

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An electric field E and a magnetic field B act over the same region in which an electron enters along the x-axis. The combination of E and B which permits the electron to go undeflected is:

The correct option is B E along Y−axis and B along Z−axis[B] gives a possible combination→FE=eE(−^j),→E=E^j→FB=evB(^j),→B=B^k

An electric field $E$ and a magnetic field $B$ act over the same region in which an electron enters along the x-axis. The combination of $E$ and $B$ which permits the electron to go undeflected is:

The correct option is B $E$ along $Y -$ axis and $B$ along $Z -$ axis
[B] gives a possible combination
$_{E} = e E (-^j), \to E = E^j$
$_{B} = e v B (^j), \to B = B^k$