A 250-turn rectangular coil of length 2.1 cm and width 1.25 cm carries a current of 85 $$\mu $$A and subjected to a magnetic field of strength 0.85 T. Work done for rotating the coil by 180o against the torque is
A
4.55 $$\mu $$J
B
2.3 $$\mu $$J
C
1.15 $$\mu $$J
D
9.1 $$\mu $$J
2
NEET 2017
MCQ (Single Correct Answer)
+4
-1
Figure shows a circuit that contains three identical resistors with resistance R = 9.0 $$\Omega $$ each, two identical inductors with inductance $$L$$ = 2.0 mH each, and an ideal battery with emf $$\varepsilon = 18V$$. The current $$i$$ through the battery just after the switch closed is
A
0.2 A
B
4 A
C
0 ampere
D
2 mA
3
NEET 2017
MCQ (Single Correct Answer)
+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
4
NEET 2017
MCQ (Single Correct Answer)
+4
-1
In an electromagnetic wave in free space that root mean square value of the electric field is Erms = 6 V m$$-$$1. The peak value of the magnetic field is
