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 71 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 2016 Phase 2
MCQ (Single Correct Answer)
+4
-1
A long wire carrying a steady current is bent into a circular loop of one turn. The magnetic field at the centre of the loop is B. It is then bent into a circular coil of n turns. The magnetic field at the centre of this coil of n turns will be
A
nB
B
n2B
C
2nB
D
2n2B
3
NEET 2016 Phase 2
MCQ (Single Correct Answer)
+4
-1
An electron is moving in a circular path under the influence of a transverse magnetic field of 3.57 $$ \times $$ 10-2 T. If the value of e/m is 1.76 $$ \times $$ 1011 C kg$$-$$1, the frequency of revoluation of the electron is
A
1 GHz
B
100 MHz
C
62.8 MHz
D
6.28 MHz
4
NEET 2016 Phase 1
MCQ (Single Correct Answer)
+4
-1
A long straight wire of radius $$a$$ carries a steady current $$I$$. The current is uniformly distributed over its cross-section. The ratio of the magnetic fields B and B', at radial distance $${a \over 2}$$ and 2$$a$$ respectively, from the axis of the wire is
A
1
B
4
C
$${1 \over 4}$$
D
$${1 \over 2}$$
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