1
NEET 2016 Phase 2
MCQ (Single Correct Answer)
+4
-1
Change Language
A uniform magnetic field is restricted within a region of rafius r. The magnetic field changes with time at a rate $${{d\overrightarrow B } \over {dt}}$$. Loop 1 of radius R > r encloses the region r and loop 2 of radius R is outside the region of magnetic field as shown in the figure. Then the e.m.f. generated is

NEET 2016 Phase 2 Physics - Electromagnetic Induction Question 28 English
A
zero in loop 1 and zero in loop 2
B
$$ - {{d\overrightarrow B } \over {dt}}\pi {r^2}$$ in loop 1 and $$ - {{d\overrightarrow B } \over {dt}}\pi {r^2}$$ in loop 2
C
$$ - {{d\overrightarrow B } \over {dt}}\pi {R^2}$$ in loop 1 and zero in loop 2
D
$$ - {{d\overrightarrow B } \over {dt}}\pi {r^2}$$ in loop 1 and zero in loop 2
2
NEET 2016 Phase 2
MCQ (Single Correct Answer)
+4
-1
Change Language
An air bubble in a glass slab with refractive index 1.5 (near normal incidence) is 5 cm deep when viewed from one surface and 3 cm deep when viewed from the opposite face. The thickness (in cm) of the slab is
A
8
B
10
C
12
D
16
3
NEET 2016 Phase 2
MCQ (Single Correct Answer)
+4
-1
Change Language
Photons with energy 5 eV are incifent on a cathode C in a photoelectric cell. The maximum energy of emitted photoelectrons is 2 eV. When photons of energy 6 eV are incident on C, no photoelectrons will reach the anode A, if the stopping potential of A relative to C is
A
+ 3 V
B
+4 V
C
$$-$$1 V
D
$$-$$3 V
4
NEET 2016 Phase 2
MCQ (Single Correct Answer)
+4
-1
Change Language
Electrons of mass m with de-Broglie wavelength $$\lambda $$ fall on the target in an X-ray tube. The cutoff wavelength ($$\lambda $$0) of the emitted X-ray is
A
$$\lambda $$0 = $${{2mc{\lambda ^2}} \over h}$$
B
$${\lambda _0} = {{2h} \over {mc}}$$
C
$${\lambda _0} = {{2{m^2}{c^2}{\lambda ^3}} \over {{h^2}}}$$
D
$${\lambda _0} = \lambda $$