(A) In the early experiments of radio communication,specifically those conducted by Jagadish Chandra Bose and Guglielmo Marconi,a $Coherer$ was used a

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(A) In the early experiments of radio communication,specifically those conducted by Jagadish Chandra Bose and Guglielmo Marconi,a $Coherer$ was used as a detector for radio waves. $A$ $Coherer$ consists of a tube filled with metal filings that change their electrical resistance when exposed to electromagnetic waves,allowing the detection of the signal.

Class 12 Physics Electromagnetic waves Maxwell's equations , Concept of displacement current and Hertz experiment

Easy

What was used to detect the radio waves?

A
Coherer
B
Transistor
C
Diode
D
Triode

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Class 12 Questions

Class 12

Physics Questions

Chapter

Electromagnetic waves

Subtopic

Maxwell's equations , Concept of displacement current and Hertz experiment

How are radio waves produced?

Easy

View Solution

Match List-$I$ with List-$II$:

List-$I$ List-$II$

$A$. Gauss's Law in Electrostatics $I$. $\oint \vec{E} \cdot d \vec{l} = -\frac{d \phi_B}{d t}$

$B$. Faraday's Law $II$. $\oint \vec{B} \cdot d \vec{A} = 0$

$C$. Gauss's Law in Magnetism $III$. $\oint \vec{B} \cdot d \vec{l} = \mu_0 i_C + \mu_0 \epsilon_0 \frac{d \phi_E}{d t}$

$D$. Ampere-Maxwell Law $IV$. $\oint \vec{E} \cdot d \vec{s} = \frac{q}{\epsilon_0}$

Choose the correct answer from the options given below:

List-$I$	List-$II$
$A$. Gauss's Law in Electrostatics	$I$. $\oint \vec{E} \cdot d \vec{l} = -\frac{d \phi_B}{d t}$
$B$. Faraday's Law	$II$. $\oint \vec{B} \cdot d \vec{A} = 0$
$C$. Gauss's Law in Magnetism	$III$. $\oint \vec{B} \cdot d \vec{l} = \mu_0 i_C + \mu_0 \epsilon_0 \frac{d \phi_E}{d t}$
$D$. Ampere-Maxwell Law	$IV$. $\oint \vec{E} \cdot d \vec{s} = \frac{q}{\epsilon_0}$