1
AP EAPCET 2025 - 21st May Morning Shift
MCQ (Single Correct Answer)
+1
-0

A wire of resistance $100 \Omega$ is stretched, so that its length increases by $20 \%$. The stretched wire is then bent in the form of a rectangle whose length and breadth are in the ratio $3: 2$. The effective resistance between the ends of any diagonal of the rectangle is

A

$36 \Omega$

B

$72 \Omega$

C

$28.8 \Omega$

D

$432 \Omega$

2
AP EAPCET 2025 - 21st May Morning Shift
MCQ (Single Correct Answer)
+1
-0

In a potentiometer experiment, when two cells of emfs $E_1$ and $E_2\left(E_2>E_1\right)$ are connected in series, the balancing length is 160 cm . If one of the cells is reversed, the balancing length decreases by $75 \%$. If $E_1=1.2 \mathrm{~V}$, then $E_2=$

A

2 V

B

2.4 V

C

1.8 V

D

1.5 V

3
AP EAPCET 2025 - 21st May Morning Shift
MCQ (Single Correct Answer)
+1
-0

The magnetic field at a distance of 10 cm from a long straight thin wire carrying a current of 4 A is

A

$6 \mu \mathrm{~T}$

B

$16 \mu \mathrm{~T}$

C

$8 \mu \mathrm{~T}$

D

$4 \mu T$

4
AP EAPCET 2025 - 21st May Morning Shift
MCQ (Single Correct Answer)
+1
-0

A velocity selector is to be constructed to select ions with a velocity of $6 \mathrm{~km} \mathrm{~s}^{-1}$. If the electric field used is $400 \mathrm{~V} \mathrm{~m}^{-1}$, then the magnetic field to be used is

A

$\frac{11}{20} T$

B

$\frac{2}{3} T$

C

$\frac{1}{15} \mathrm{~T}$

D

$\frac{2}{15} \mathrm{~T}$