Electromagnetism
Current Electricity
MCQ (Single Correct Answer)
Moving Charges and Magnetism
MCQ (Single Correct Answer)
Magnetism and Matter
MCQ (Single Correct Answer)
Electromagnetic Induction
MCQ (Single Correct Answer)
Alternating Current
MCQ (Single Correct Answer)
Electromagnetic Waves
MCQ (Single Correct Answer)
Modern Physics
Dual Nature of Radiation
MCQ (Single Correct Answer)
Semiconductor Devices and Logic Gates
MCQ (Single Correct Answer)
Communication Systems
MCQ (Single Correct Answer)
1
COMEDK 2021
MCQ (Single Correct Answer)
+1
-0

Work done in moving a charge of 25C is 50 J. Calculate potential difference, between two points.

A
0.5 V
B
1 V
C
2 V
D
2.5 V
2
COMEDK 2021
MCQ (Single Correct Answer)
+1
-0

What is the electric field near infinite plane sheet of charge density $$\sigma$$ ?

A
$${\sigma \over {2{\varepsilon _0}}}$$
B
$${{\sigma A} \over {2{\varepsilon _0}}}$$
C
$${\sigma \over {2{\varepsilon _0}A}}$$
D
$${\sigma \over {{\varepsilon _0}}}$$
3
COMEDK 2020
MCQ (Single Correct Answer)
+1
-0

Consider a thin spherical shell of radius R consisting of uniform surface charge density s. The electric field at a point of distance x from its centre and outside the shell is

A
inversely proportional to $$s$$
B
directly proportional to $$x^2$$
C
directly proportional to $$R$$
D
inversely proportional to $$x^2$$
4
COMEDK 2020
MCQ (Single Correct Answer)
+1
-0

A charge of 0.8 C is divided into two charges Q$$_1$$ and Q$$_2$$. These are kept at a separation of 30 cm. The force on Q$$_1$$ is maximum when

A
$$Q_1=Q_2=0.4$$ C
B
$$Q_1 \approx 0.8$$ C, $$Q_2$$ negligible
C
$$Q_1$$ negligible, $$Q_2 \approx 0.8$$ C
D
$$Q_1=0.2$$ C, $$Q_2=0.6$$ C
COMEDK Subjects