1
JEE Main 2021 (Online) 18th March Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
Imagine that the electron in a hydrogen atom is replaced by a muon ($$\mu$$). The mass of muon particle is 207 times that of an electron and charge is equal to the charge of an electron. The ionization potential of this hydrogen atom will be :
A
13.6 eV
B
2815.2 eV
C
331.2 eV
D
27.2 eV
2
JEE Main 2021 (Online) 18th March Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
A plane electromagnetic wave of frequency 100 MHz is travelling in vacuum along the x-direction. At a particular point in space and time, $$\overrightarrow B = 2.0 \times {10^{ - 8}}\widehat kT$$. (where, $$\widehat k$$ is unit vector along z-direction) What is $$\overrightarrow E $$ at this point?
A
0.6 $$\widehat j$$ V/m
B
6.0 $$\widehat k$$ V/m
C
6.0 $$\widehat j$$ V/m
D
0.6 $$\widehat k$$ V/m
3
JEE Main 2021 (Online) 18th March Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
A thin circular ring of mass M and radius r is rotating about its axis with an angular speed $$\omega$$. Two particles having mass m each are now attached at diametrically opposite points. The angular speed of the ring will become :
A
$$\omega {M \over {M + m}}$$
B
$$\omega {{M + 2m} \over M}$$
C
$$\omega {M \over {M + 2m}}$$
D
$$\omega {{M - 2m} \over {M + 2m}}$$
4
JEE Main 2021 (Online) 18th March Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
Four identical long solenoids A, B, C and D are connected to each other as shown in the figure. If the magnetic field at the center of A is 3T, the field at the center of C would be : (Assume that the magnetic field is confined with in the volume of respective solenoid).

JEE Main 2021 (Online) 18th March Morning Shift Physics - Magnetic Effect of Current Question 88 English
A
12T
B
6T
C
9T
D
1T
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