1
JEE Main 2024 (Online) 5th April Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

An electron rotates in a circle around a nucleus having positive charge $$\mathrm{Ze}$$. Correct relation between total energy (E) of electron to its potential energy (U) is :

A
$$2 \mathrm{E}=3 \mathrm{U}$$
B
$$\mathrm{E}=\mathrm{U}$$
C
$$2 \mathrm{E}=\mathrm{U}$$
D
$$\mathrm{E}=2 \mathrm{U}$$
2
JEE Main 2024 (Online) 5th April Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Time periods of oscillation of the same simple pendulum measured using four different measuring clocks were recorded as $$4.62 \mathrm{~s}, 4.632 \mathrm{~s}, 4.6 \mathrm{~s}$$ and $$4.64 \mathrm{~s}$$. The arithmetic mean of these readings in correct significant figure is :

A
5 s
B
4.6 s
C
4.62 s
D
4.623 s
3
JEE Main 2024 (Online) 5th April Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The angle between vector $$\vec{Q}$$ and the resultant of $$(2 \vec{Q}+2 \vec{P})$$ and $$(2 \vec{Q}-2 \vec{P})$$ is :

A
$$ \tan ^{-1}(\mathrm{P} / \mathrm{Q}) $$
B
0$$^\circ$$
C
$$ \tan ^{-1} \frac{(2 \vec{Q}-2 \vec{P})}{2 \vec{Q}+2 \vec{P}} $$
D
$$ \tan ^{-1}(2 Q / \mathrm{P}) $$
4
JEE Main 2024 (Online) 5th April Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
In a co-axial straight cable, the central conductor and the outer conductor carry equal currents in opposite directions. The magnetic field is zero :
A
inside the outer conductor
B
outside the cable
C
in between the two conductors
D
inside the inner conductor
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