JEE Main · 2007 · 29 Apr 2007 · Offline · Electrostatics

WhatsApp Email

g_{E}

and

g_{m}

are the accelerations due to gravity on the surfaces of the earth and the moon respectively and if Millikan's oil drop experiment could be performed on the two surfaces, one will find the ratio

\frac{electronic charge on the moon}{electronic charge on the earth}

to be

(A)1✓ Correct
(B)0
(C) $g_{E} / g_{m}$
(D) $g_{m} / g_{E}$

Answer: (A)

Solution

The charge on an electron is a fundamental constant of nature; it does not depend on where the measurement is made or on the local strength of gravity. Carrying out Millikan's experiment on the Moon would therefore return the very same electronic charge as on the Earth, so the ratio of the two is exactly

1

JEE Main · 2007 · 29 Apr 2007 · Offline · Single correct option

Practise more: all JEE Main PYQs on Electrostatics →

More JEE Main questions on Electrostatics

Six point charges are kept 60° apart from each other on the circumference of a circle of radius R as shown in figure. The net electric field at the centre of the circle is ______.
( $ϵ_{0}$ is permittivity of free space)
JEE Main 2026View solution →
Electric field in a region is given by $E = A x \hat{i} + B y \hat{j}$ , where $A = 10 V / m^{2}$ and $B = 5 V / m^{2}$ . If the electric potential at a point $(10, 20)$ is 500 V , then the electric potential at origin is ____ V.
JEE Main 2026View solution →
Three small identical bubbles of water having same charge on each coalesce to form a bigger bubble. Then the ratio of the potentials on one initial bubble and that on the resultant bigger bubble is :
JEE Main 2026View solution →
Five positive charges each having charge $q$ are placed at the vertices of a pentagon as shown in the figure. The electric potential ( $V$ ) and the electric field ( $E$ ) at the center O of the pentagon due to these five positive charges are:
JEE Main 2026View solution →
Two point charges 2q and q are placed at vertex A and centre of face CDEF of the cube as shown in figure. The electric flux passing through the cube is :
JEE Main 2026View solution →
Two shorts dipoles $(A, B)$ , A having charges $\pm 2 μ C$ and length 1 cm and $B$ having charges $\pm 4 μ C$ and length 1 cm are placed with their centres 80 cm apart as shown in the figure. The electric field at a point $P$ , equi-distant from the …
JEE Main 2026View solution →