COMEDK 2020 | Electrostatics Question 22 | Physics

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

inversely proportional to $$s$$

directly proportional to $$x^2$$

directly proportional to $$R$$

inversely proportional to $$x^2$$

COMEDK 2020

MCQ (Single Correct Answer)

-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

$$Q_1=Q_2=0.4$$ C

$$Q_1 \approx 0.8$$ C, $$Q_2$$ negligible

$$Q_1$$ negligible, $$Q_2 \approx 0.8$$ C

$$Q_1=0.2$$ C, $$Q_2=0.6$$ C

COMEDK 2020

MCQ (Single Correct Answer)

-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

direction from positive charge to negative charge

direction from negative charge to positive charge

perpendicular to the line joining the two charges drawn at the centre and pointing upward direction

perpendicular to the line joining the two charges at the centre and pointing downward direction

COMEDK 2020

MCQ (Single Correct Answer)

-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

$$\frac{\pi}{6}$$

$$\frac{\pi}{3}$$

$$\frac{\pi}{2}$$

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