1
NEET 2017
MCQ (Single Correct Answer)
+4
-1
An arrangement of three parallel straight wires placed perpendicular to plane of paper carrying same current $$'I'$$ along the same direction as shown in fogure. Magnitude of force per unit length on the middle wire $$'B'$$ is given by

NEET 2017 Physics - Moving Charges and Magnetism Question 72 English
A
$${{2{\mu _0}{I^2}} \over {\pi d}}$$
B
$${{\sqrt 2 {\mu _0}{I^2}} \over {\pi d}}$$
C
$${{{\mu _0}{I^2}} \over {\sqrt 2 \pi d}}$$
D
$${{{\mu _0}{I^2}} \over {2\pi d}}$$
2
NEET 2017
MCQ (Single Correct Answer)
+4
-1
If $$\theta $$1 and $$\theta $$2 be the apparent angles of dip observed in two vertical planes at right angles to each other, then the true angle of dip $$\theta $$ is given by
A
tan2$$\theta $$ = tan2$$\theta $$1 + tan2$$\theta $$2
B
cot2$$\theta $$ = cot2$$\theta $$1 $$-$$cot2$$\theta $$2
C
tan2$$\theta $$ = tan2$$\theta $$1 $$-$$ tan2$$\theta $$2
D
cot2$$\theta $$ = cot2$$\theta $$1 + cot2$$\theta $$2
3
NEET 2017
MCQ (Single Correct Answer)
+4
-1
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
4
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
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