1
JEE Advanced 2018 Paper 1 Offline
MCQ (More than One Correct Answer)
+4
-1
Change Language
Two infinitely long straight wires lie in the $$xy$$-plane along the lines $$x = \pm R.$$ The wire located at $$x = + R$$ carries a constant current $${I_1}$$ and the wire located at $$x=-R$$ carries a constant current $${I_2}.$$ A circular loop of radius $$R$$ is suspended with its center at $$\left( {0,0,\sqrt 3 R} \right)$$ and in a plane parallel to the $$xy$$-plane. This loop carries a constant current $$I$$ in the clockwise direction as seen from above the loop. The current in the wire is taken to be positive if it is in the $$ + \widehat j$$ direction. which of the following statements regarding the magnetic field $$\overrightarrow B $$ is (are) true?
A
If $${I_1} = {I_2},$$ then $$\overrightarrow B $$ cannot be equal to zero at the origin $$(0,0,0)$$
B
If $${I_1} > 0$$ and $${I_2} < 0,$$ then $$\overrightarrow B $$ can be equal to zero at the origin $$(0,0,0)$$
C
If $${I_1} < 0$$ and $${I_2} > 0,$$ then $$\overrightarrow B $$ can be equal to zero at the origin $$(0,0,0)$$
D
If $${I_1} = {I_2},$$ then the $$z$$-component of the magnetic field at the center of the loop is $$\left( { - {{{\mu _0}I} \over {2R}}} \right)$$
2
JEE Advanced 2018 Paper 1 Offline
Numerical
+3
-0
Change Language
Two men are walking along a horizontal straight line in the same direction. The man in front walks at a speed $$1.0\,m{s^{ - 1}}$$ and the man behind walks at a speed $$2.0\,m{s^{ - 1}}.$$ A third man in standing at a height $$12$$ $$m$$ above the same horizontal line such that all three men are in a vertical plane. The two walking men are blowing identical whistles which emit a sound of frequency $$1430$$ $$Hz$$. The speed of sound in air is $$330\,m{s^{ - 1}}.$$ At the instant, when the moving men are $$10$$ $$m$$ apart, the stationary man is equidistant from them. The frequency of beats in $$Hz,$$ heard by the stationary man at this instant, is _____________.
Your input ____
3
JEE Advanced 2018 Paper 1 Offline
Numerical
+3
-0
Change Language
A spring-block system is resting on a frictionless floor as shown in the figure. The spring constant is $$2.0\,N{m^{ - 1}}$$ and the mass of the block is $$2.0$$ $$kg.$$ Ignore the mass of the spring. Initially the spring is an unstretched condition. Another block of mass $$1.0$$ $$kg$$ moving with a speed of $$2.0$$ $$m{s^{ - 1}}$$ collides elastically with the first block. The collision is such that the $$2.0$$ $$kg$$ block does not hit the wall. The distance, in metres, between the two blocks when the spring returns to its unstretched position for the first time after the collision is __________.

JEE Advanced 2018 Paper 1 Offline Physics - Work Power & Energy Question 14 English
Your input ____
4
JEE Advanced 2018 Paper 1 Offline
MCQ (More than One Correct Answer)
+4
-1
Change Language
One mole of a monatomic ideal gas undergoes a cyclic process as shown in the figure (where $$V$$ is the volume and $$T$$ is the temperature). Which of the statements below is (are) true?

JEE Advanced 2018 Paper 1 Offline Physics - Heat and Thermodynamics Question 55 English
A
Process $${\rm I}$$ is an isochoric process
B
In process $${\rm II}$$, gas absorbs heat
C
In process $${\rm IV}$$, gas releases heat
D
Process $${\rm I}$$ and $${\rm III}$$ are not isobaric
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