1
AP EAPCET 2025 - 26th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

The magnetic field at the centre of a long solenoid having 400 turns per unit length and carrying a current ' $i$ ' is $6.24 \times 10^{-2} \mathrm{~T}$. The magnetic field at the centre of another long solenoid having 200 turns per unit length and carrying a current $\frac{i}{2}$ is

A

$1.56 \times 10^{-2} \mathrm{~T}$

B

$2.4 \times 10^{-2} \mathrm{~T}$

C

$26 \times 10^{-2} \mathrm{~T}$

D

$2.6 \times 10^{-2} \mathrm{~T}$

2
AP EAPCET 2025 - 26th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

If a proton of kinetic energy 8.35 MeV enters a uniform magnetic field of 10 T at right angles to the direction of the field, then the force acting on the proton is

(Mass of proton $=1.67 \times 10^{-27} \mathrm{~kg}$ and Charge of proton $=1.6 \times 10^{-19} \mathrm{C}$ )

A

$48 \times 10^{-12} \mathrm{~N}$

B

$16 \times 10^{-12} \mathrm{~N}$

C

$64 \times 10^{-12} \mathrm{~N}$

D

$32 \times 10^{-12} \mathrm{~N}$

3
AP EAPCET 2025 - 26th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

A sample of a ferromagnetic iron in the shape of a cube of side $1.0 \mu \mathrm{~m}$ contains $8.7 \times 10^{28}$ atoms per cubic metre and the magnetic dipole moment of each iron atom is $93 \times 10^{-24} \mathrm{Am}^2$. Then, the maximum possible magnetic dipole moment (in $\mathrm{Am}^2$ ) of the sample is nearly

A

$8.1 \times 10^{-12}$

B

$8.1 \times 10^{-14}$

C

$81 \times 10^{-14}$

D

$81 \times 10^{-16}$

4
AP EAPCET 2025 - 26th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

When current in a coil changes from 2 A to 5 A in time of 0.3 s , if the emf induced in the coil is 40 mv , then the self inductance of the coil is

A

4 H

B

4 mH

C

40 mH

D

$4 \mu \mathrm{H}$