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JEE Main 2021 (Online) 17th March Evening Shift
Numerical
+4
-1
The electric field intensity produced by the radiation coming from a 100 W bulb at a distance of 3 m is E. The electric field intensity produced by the radiation coming from 60W at the same distance is $$\sqrt {{x \over 5}}$$E. Where the value of x = ____________.
2
JEE Main 2021 (Online) 17th March Evening Shift
Numerical
+4
-1
The electric field in a region is given by $$\overrightarrow E = {2 \over 5}{E_0}\widehat i + {3 \over 5}{E_0}\widehat j$$ with $${E_0} = 4.0 \times {10^3}{N \over C}$$. The flux of this field through a rectangular surface area 0.4 m2 parallel to the Y-Z plane is __________ Nm2C$$-$$1.
3
JEE Main 2021 (Online) 26th February Evening Shift
Numerical
+4
-1
27 similar drops of mercury are maintained at 10V each. All these spherical drops combine into a single big drop. The potential energy of the bigger drop is __________ times that of a smaller drop.
4
JEE Main 2021 (Online) 25th February Evening Shift
Numerical
+4
-1
English
Hindi
The peak electric field produced by the radiation coming from the 8W bulb at a distance of 10 m is $${x \over {10}}\sqrt {{{{\mu _0}c} \over \pi }} {V \over m}$$. The efficiency of the bulb is 10% and it is a point source. The value of x is ___________.