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 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 $$x^2$$
2
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
3
COMEDK 2020
MCQ (Single Correct Answer)
+1
-0

An electric dipole has a pair of equal and opposite point charges $$q$$ and $$-q$$ separated by a distance $$2x$$. The axis of the dipole is defined as

A
direction from positive charge to negative charge
B
direction from negative charge to positive charge
C
perpendicular to the line joining the two charges drawn at the centre and pointing upward direction
D
perpendicular to the line joining the two charges at the centre and pointing downward direction
4
COMEDK 2020
MCQ (Single Correct Answer)
+1
-0

An electric dipole is placed in a uniform electric field with the dipole axis making an angle $$\theta$$ with the direction of the electric field. The orientation of the dipole for stable equilibrium is

A
$$\frac{\pi}{6}$$
B
$$\frac{\pi}{3}$$
C
0
D
$$\frac{\pi}{2}$$
COMEDK Subjects