1
NEET 2017
MCQ (Single Correct Answer)
+4
-1
Change Language
The diagrams below show regions of equipotentials.

NEET 2017 Physics - Electrostatics Question 71 English
A positive charge is moved from A to B in each diagram.
A
In all the four cases the work done is the same.
B
Minimum work is required to move q in figure(I).
C
Maximum work is required to move q in figure (II).
D
Maximum work is required to move q in figure (III)
2
NEET 2017
MCQ (Single Correct Answer)
+4
-1
Change Language
The resistance of a wire is 'R' ohm. If it is melted and stretched to 'n' times its original length. its new resistance will be
A
$${R \over n}$$
B
n2R
C
$${R \over {{n^2}}}$$
D
nR
3
NEET 2017
MCQ (Single Correct Answer)
+4
-1
Change Language
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
Change Language
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 78 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
$${{{\mu _0}{I^2}} \over {2\pi d}}$$