1
KCET 2025
MCQ (Single Correct Answer)
+1
-0

Two thin long parallel wires separated by a distance ' $r$ ' from each other in vacuum carry a current of I ampere in opposite directions. Then, they will

A
Attract each other with a force per unit length of $\frac{\mu_0 I^2}{2 \pi r}$
B
Repel each other with a force per unit length of $\frac{\mu_0 I^2}{2 \pi r}$
C
Repel each other with a force per unit length of $\frac{\mu_0 I^2}{2 \pi r^2}$
D
Attract each other with a force per unit length of $\frac{\mu_0 I^2}{2 \pi r^2}$
2
KCET 2025
MCQ (Single Correct Answer)
+1
-0

A solenoid is 1 m long and 4 cm in diameter. It has five layers of windings of 1000 turns each and carries a current of 7A. The magnetic field at the centre of the solenoid is

A
$0.4396 \times 10^{-5} \mathrm{~T}$
B
$4.396 \times 10^{-2} \mathrm{~T}$
C
$43.96 \times 10^{-2} \mathrm{~T}$
D
439.6 T
3
KCET 2025
MCQ (Single Correct Answer)
+1
-0

Two similar galvanometers are covered into an ammeter and a milliammeter. The shunt resistance of ammeter as compared to the shunt resistance of milliammeter will be

A
Zero
B
More
C
Less
D
Equal
4
KCET 2025
MCQ (Single Correct Answer)
+1
-0

Which of the following statements is true in respect of diamagnetic susbtances?

A
They are feebly attracted by magnets
B
Permeability is greater than 1000
C
Susceptibility decreases with temperature.
D
Susceptibility is small and negative
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