1
JEE Main 2023 (Online) 29th January Morning Shift
Numerical
+4
-1
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A certain elastic conducting material is stretched into a circular loop. It is placed with its plane perpendicular to a uniform magnetic field B = 0.8 T. When released the radius of the loop starts shrinking at a constant rate of 2 cms$$^{-1}$$. The induced emf in the loop at an instant when the radius of the loop is 10 cm will be __________ mV.

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2
JEE Main 2023 (Online) 29th January Morning Shift
Numerical
+4
-1
Out of Syllabus
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A radioactive element $$_{92}^{242}$$X emits two $$\alpha$$-particles, one electron and two positrons. The product nucleus is represented by $$_{\mathrm{P}}^{234}$$Y. The value of P is __________.

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3
JEE Main 2023 (Online) 29th January Morning Shift
Numerical
+4
-1
Change Language

A tennis ball is dropped on to the floor from a height of 9.8 m. It rebounds to a height 5.0 m. Ball comes in contact with the floor for 0.2s. The average acceleration during contact is ___________ ms$$^{-2}$$.

(Given g = 10 ms$$^{-2}$$)

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