(B) When a charge $q$ is accelerated through a potential difference $V$,its kinetic energy is given by $\frac{1}{2}mv^2 = qV$. This implies $mv = \sqr

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(B) When a charge $q$ is accelerated through a potential difference $V$,its kinetic energy is given by $\frac{1}{2}mv^2 = qV$. This implies $mv = \sqrt{2mqV}$. The radius $r$ of the circular path in a magnetic field $B$ is given by $r = \frac{mv}{qB}$. Substituting the value of $mv$,we get $r = \frac{\sqrt{2mqV}}{qB}$. Since $m, q,$ and $B$ are constant,we have $r \propto \sqrt{V}$. If the radius becomes $2r$,then $\frac{r'}{r} = \frac{\sqrt{V'}}{\sqrt{V}} = 2$. Squaring both sides,$\frac{V'}{V} = 4$,which gives $V' = 4V$.

Class 12 Physics Moving Charges and Magnetism Mix Examples-Moving Charges and Magnetism

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$A$ charge $q$ is accelerated through a potential difference $V$. It is then passed normally through a uniform magnetic field,where it moves in a circle of radius $r$. The potential difference required to move it in a circle of radius $2r$ is (in $V$)

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Moving Charges and Magnetism

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Mix Examples-Moving Charges and Magnetism

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Match the following and find the correct pairs.
List-$I$ List-$II$
$(A)$ Fleming's left hand rule $(i)$ Direction of induced current
$(B)$ Right hand thumb rule (ii) Magnitude and direction of magnetic induction
$(C)$ Biot-Savart law (iii) Direction of force due to magnetic induction
$(D)$ Fleming's right hand rule (iv) Direction of magnetic lines due to current

List-$I$	List-$II$
$(A)$ Fleming's left hand rule	$(i)$ Direction of induced current
$(B)$ Right hand thumb rule	(ii) Magnitude and direction of magnetic induction
$(C)$ Biot-Savart law	(iii) Direction of force due to magnetic induction
$(D)$ Fleming's right hand rule	(iv) Direction of magnetic lines due to current

EasyAP EAMCET 2011

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$A$ loop of irregular shape made of flexible conducting wire carrying a clockwise current is placed in a uniform inward magnetic field,such that its plane is perpendicular to the field. Then the loop:

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Match the following:
List-$I$ List-$II$
$a$. Fleming's left-hand rule $e$. Direction of induced current
$b$. Fleming's right-hand rule $f$. South pole
$c$. Clockwise current $g$. North pole
$d$. Anticlockwise current $h$. Direction of force

The correct answer is:

EasyAP EAMCET 2017

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Which of the following statements is correct?

Medium

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Which of the following is not a unit of magnetic induction?

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List-$I$	List-$II$
$a$. Fleming's left-hand rule	$e$. Direction of induced current
$b$. Fleming's right-hand rule	$f$. South pole
$c$. Clockwise current	$g$. North pole
$d$. Anticlockwise current	$h$. Direction of force

$A$ charge $q$ is accelerated through a potential difference $V$. It is then passed normally through a uniform magnetic field,where it moves in a circle of radius $r$. The potential difference required to move it in a circle of radius $2r$ is (in $V$)

Similar Questions

$A$ loop of irregular shape made of flexible conducting wire carrying a clockwise current is placed in a uniform inward magnetic field,such that its plane is perpendicular to the field. Then the loop:

Match the following:List-$I$List-$II$$a$. Fleming's left-hand rule$e$. Direction of induced current$b$. Fleming's right-hand rule$f$. South pole$c$. Clockwise current$g$. North pole$d$. Anticlockwise current$h$. Direction of forceThe correct answer is:

Which of the following statements is correct?

Which of the following is not a unit of magnetic induction?

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Match the following:
List-$I$ List-$II$
$a$. Fleming's left-hand rule $e$. Direction of induced current
$b$. Fleming's right-hand rule $f$. South pole
$c$. Clockwise current $g$. North pole
$d$. Anticlockwise current $h$. Direction of force

The correct answer is: