1
NEET 2017
+4
-1
A long solenoid of diameter 0.1 m has 2 $$\times$$ 104 turns per meter. At the centre of the solenoid, a coil of 100 turns and radius 0.01 m is placed with its axis coinciding with the solenoid axis. The current in the solenoid reduces at a constant rate to 0 A from 4 A in 0.05 s. If the resistance of the coil is 10 $$\pi$$2 $$\Omega$$, the total charge flowing through the coil during this time is
A
16 $$\mu$$C
B
32 $$\mu$$C
C
16$$\pi$$ $$\mu$$C
D
32$$\pi$$ $$\mu$$C
2
NEET 2016 Phase 2
+4
-1
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

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
3
NEET 2016 Phase 1
+4
-1
A long solenoid has 1000 turns. When a current of 4 A flows through it, the magnetic flux linked with each turn of the solenoid is 4 $$\times \,{10^{ - 3}}$$ Wb. The self-inductance of the solenoid is
A
2 H
B
1 H
C
4 H
D
3 H
4
AIPMT 2015
+4
-1
An electron moves on a straight line path XY as shown. The abcd is a coil adjacent to the path of electron. What will be the direction of current, if any, induced in the coil ?

A
The current will reverse its direction as the electron goes past the coil
B
No current induced
C
abcd
D