1
JEE Main 2022 (Online) 27th June Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

If L, C and R are the self inductance, capacitance and resistance respectively, which of the following does not have the dimension of time?

A
RC
B
$${L \over R}$$
C
$$\sqrt{LC}$$
D
$${L \over C}$$
2
JEE Main 2022 (Online) 27th June Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Given below are two statements :

Statement I : A time varying electric field is a source of changing magnetic field and vice-versa. Thus a disturbance in electric or magnetic field creates EM waves.

Statement II : In a material medium, the EM wave travels with speed $$v = {1 \over {\sqrt {{\mu _0}{ \in _0}} }}$$. In the light of the above statements, choose the correct answer from the options given below.

A
Both Statement I and Statement II are true
B
Both Statement I and Statement II are false
C
Statement I is correct but Statement II is false
D
Statement I is incorrect but Statement II is true
3
JEE Main 2022 (Online) 27th June Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The current flowing through an ac circuit is given by

I = 5 sin(120$$\pi$$t)A

How long will the current take to reach the peak value starting from zero?

A
$${1 \over {60}}$$ s
B
60 s
C
$${1 \over {120}}$$ s
D
$${1 \over {240}}$$ s
4
JEE Main 2022 (Online) 26th June Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Two coils of self inductance L1 and L2 are connected in series combination having mutual inductance of the coils as M. The equivalent self inductance of the combination will be :

JEE Main 2022 (Online) 26th June Evening Shift Physics - Alternating Current and Electromagnetic Induction Question 73 English

A
$${1 \over {{L_1}}} + {1 \over {{L_2}}} + {1 \over M}$$
B
$${L_1} + {L_2} + M$$
C
$${L_1} + {L_2} + 2M$$
D
$${L_1} + {L_2} - 2M$$
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