1
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

2
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

$4 \mu T$

3
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

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

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

A closely wound solenoid of 1200 turns and area of cross-section $5 \mathrm{~cm}^2$ carries a current. If the magnetic moment of the solenoid is $1.2 \mathrm{JT}^{-1}$, then the current through the solenoid is

A

2.5 A

B

2 A

C

3 A

D

1.5 A