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](https://neetcare-image.cdn.examgoal.net/1qpqahkk7zbokc9/5990b959-5ce1-41ca-b235-8a5b86cc3450/76406e90-6a30-11ea-aedc-f1c8d8e0194b/file-1qpqahkk7zbokca-491w.jpg)
![NEET 2017 Physics - Moving Charges and Magnetism Question 72 English](https://neetcare-image.cdn.examgoal.net/1qpqahkk7zbokc9/5990b959-5ce1-41ca-b235-8a5b86cc3450/76406e90-6a30-11ea-aedc-f1c8d8e0194b/file-1qpqahkk7zbokca-491w.jpg)
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
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
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
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