1
JEE Main 2019 (Online) 9th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
A particle is moving with a velocity

$$\overrightarrow v \, = K(y\widehat i + x\widehat j),$$ where K is a constant.

The general equation for its path is :
A
y = x2 + constant
B
y2 = x + constant
C
y2 = x2 + constant
D
xy = constant
2
JEE Main 2019 (Online) 9th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
A plane electromagnetic wave of frequency 50 MHz travels in free space along the positive x-direction. At a particular point in space and time, $$\overrightarrow E = 6.3\widehat j\,V/m.$$ The corresponding magnetic field $$\overrightarrow {B,} $$ at that point will be :
A
18.9 $$ \times $$ 10$$-$$8 $$\widehat k$$T
B
2.1 $$ \times $$ 10$$-$$8 $$\widehat k$$T
C
6.3 $$ \times $$ 10$$-$$8 $$\widehat k$$T
D
18.9 $$ \times $$ 108 $$\widehat k$$T
3
JEE Main 2019 (Online) 9th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
An infinitely long current carrying wire and a small current carrying loop are in the plane of the paper as shown. The radius of the loop is a and distance of its centre from the wire is d (d > > a). If the loop a applies a force F on the wire then :

JEE Main 2019 (Online) 9th January Morning Slot Physics - Magnetic Effect of Current Question 177 English
A
$$F = 0$$
B
$$F \propto \left( {{a \over d}} \right)$$
C
$$F \propto \left( {{{{a^2}} \over {{d^3}}}} \right)$$
D
$$F \propto {\left( {{a \over d}} \right)^2}$$
4
JEE Main 2019 (Online) 9th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
Three blocks A, B and C are lying on a smooth horizontal surface, as shown in the figure. A and B have equal masses, m while C has mass M, Block A is given an initial speed $$\upsilon $$ towards B due to which it collides with B perfectly inelastically. The combined mass collides with C, also perfectly inelastically $${5 \over 6}$$th of the initial kinetic energy is lost in whole process. What is value of M/m ?

JEE Main 2019 (Online) 9th January Morning Slot Physics - Center of Mass and Collision Question 101 English
A
5
B
2
C
4
D
3
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