1
COMEDK 2025 Evening Shift
MCQ (Single Correct Answer)
+1
-0
In a particular case X , a certain length of insulated copper wire is bent to form double loops of equal radii. In another case Y the same copper wire is bent to form three loops of equal radii. If the same steady current is passed through the copper wire in both the cases, the ratio of magnetic field at the centre in the case X to that in case Y is:
A
$\frac{1}{4}$
B
$\frac{1}{9}$
C
$\frac{9}{4}$
D
$\frac{4}{9}$
2
COMEDK 2025 Evening Shift
MCQ (Single Correct Answer)
+1
-0
A straight wire of mass 250 g and length 2.5 m carries a current of 4 A . It can be suspended in mid air by a uniform horizontal magnetic field of magnitude:
A
0.145 T
B
0.245 T
C
0.625 T
D
2.245 T
3
COMEDK 2025 Evening Shift
MCQ (Single Correct Answer)
+1
-0

A current carrying closed loop in the form of a right isosceles triangle XYZ is placed in a uniform magnetic field $B$ acting along $X Y$ of the loop. If the magnetic force on the arm $Y Z$ is $\sqrt{2} F$, then the force on the arm $X Z$ is:

A
$-\sqrt{2} F$
B
$\frac{\mathrm{F}}{\sqrt{2}}$
C
$+2 \sqrt{2} F$
D
$-F$
4
COMEDK 2025 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0
Which physical quantity has the unit joule / tesla?
A
Magnetic permeability
B
Magnetic Induction
C
Magnetic Susceptibility
D
Magnetic dipole moment.
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