JEE Main 2017 (Offline) | Alternating Current and Electromagnetic Induction Question 187 | Physics

JEE Main 2017 (Offline)

MCQ (Single Correct Answer)

-1

In a coil of resistance 100 $$\Omega $$, a current is induced by changing the magnetic flux through it as shown in the figure. The magnitude of change in flux through the coil is:

JEE Main 2017 (Offline) Physics - Alternating Current and Electromagnetic Induction Question 190 English

JEE Main 2017 (Offline) Physics - Alternating Current and Electromagnetic Induction Question 190 English

275 Wb

200 Wb

225 Wb

250 Wb

JEE Main 2016 (Online) 10th April Morning Slot

MCQ (Single Correct Answer)

-1

A conducting metal circular-wire-loop of radius r is placed perpendicular to a magnetic field which varies with time as
B = B₀e$${^{{{ - t} \over r}}}$$ , where B₀ and $$\tau $$ are constants, at time t = 0. If the resistance of the loop is R then the heat generated in the loop after a long time (t $$ \to $$ $$\infty $$) is :

$${{{\pi ^2}{r^4}B_0^4} \over {2\tau R}}$$

$${{{\pi ^2}{r^4}B_0^2} \over {2\tau R}}$$

$${{{\pi ^2}{r^4}B_0^2R} \over \tau }$$

$${{{\pi ^2}{r^4}B_0^2} \over {\tau R}}$$

JEE Main 2016 (Online) 10th April Morning Slot

MCQ (Single Correct Answer)

-1

Consider an electromagnetic wave propagating in vacuum. Choose the correct statement :

For an electromagnetic wave propagating in +x direction the electric field is $$\vec E = {1 \over {\sqrt 2 }}{E_{yz}}{\mkern 1mu} \left( {x,t} \right)\left( {\hat y - \hat z} \right)$$

and the magnetic field is $$\vec B = {1 \over {\sqrt 2 }}{B_{yz}}{\mkern 1mu} \left( {x,t} \right)\left( {\hat y + \hat z} \right)$$

For an electromagnetic wave propagating in +x direction the electric field is $$\vec E = {1 \over {\sqrt 2 }}{E_{yz{\mkern 1mu} }}\left( {y,z,t} \right)\left( {\hat y + \hat z} \right)$$

and the magnetic field is $$\vec B = {1 \over {\sqrt 2 }}{B_{yz{\mkern 1mu} }}\left( {y,z,t} \right)\left( {\hat y + \hat z} \right)$$

For an electromagnetic wave propagating in + y direction the electric field is $$\overrightarrow E = {1 \over {\sqrt 2 }}{E_{yz{\mkern 1mu} }}\left( {x,t} \right)\widehat y$$
and the magnetic field is $$\vec B = {1 \over {\sqrt 2 }}{B_{yz{\mkern 1mu} }}\left( {x,t} \right)\widehat z$$

For an electromagnetic wave propagating in + y direction the electric field is $$\overrightarrow E = {1 \over {\sqrt 2 }}{E_{yz{\mkern 1mu} }}\left( {x,t} \right)\widehat z$$
and the magnetic field is $$\overrightarrow B = {1 \over {\sqrt 2 }}{B_{z{\mkern 1mu} }}\left( {x,t} \right)\widehat y$$

JEE Main 2016 (Online) 9th April Morning Slot

MCQ (Single Correct Answer)

-1

Microwave oven acts on the principle of :

transferring electrons from lower to higher energy levels in water molecule

giving rotational energy to water molecules

giving vibrational energy to water molecules

giving translational energy to water molecules

PREVIOUS NEXT