Class 12 ELECTROSTATICS

You acquire 50C charge while rubbing your legs on carpet, find the number of electron in your body during this process?

• 3.125*10¹⁹ electron

• 3.125*10^-19 electron

• 3.125*10²⁰ electron

• 3.125*10^{-20 electron}

Estimate the number of electron in 100 gram of water.

• 3.35*10²⁵

• 1.23*10²³

• 3.21*10²²

• 3.12*10²⁴

Two particles A and B having charges 8*10^-6 C and -2*10^-6 C are held at a separation of 20 cm. Where should a third charged be placed so that it does not experience a net electric force?

• x=10 cm

• x=20 cm

• x=30 cm

• x= 15 cm

A charge Q is divided into two objects. What should be the values of the charges on the objects so that the force between the objects can be maximum?

• q=Q, Same as original charge

• q=Q/3, One/third of original charge

• q=Q/2, Half of original charge

• q=2Q, Double of original charge

How much work is done by a battery when 10C of charge is passed through it by a potential difference of 12 V?

• 0.83J

• 120J

• 1.2J

• None of the above

When the separation between two charges is increased, the electric field intensity .....

• Remains the same

• increases

• decreases

• May increase or decrease

If a body is charged by rubbing, its weight remains...

• Precisely constant

• Increases slightly

• Decreases slightly

• May increases or decrease slightly

An electric dipole is placed in a uniform electric field. The net electric force on the dipole...

• Is always zero

• Depends on the orientation of the dipole

• Can never be zero

• Depends on the strength of the dipole

At what separation should two equal charges of 1 C each be placed so that the force between them equals the weight of a 50 kg person?

• 3.4*10³ m

• 4.3*10^-3 m

• 4.3*10³ m

• 2.4*10^{3 m}

Find the force between a proton and electron when they revolve in a circle of radius o.53 Angstrom.

• 2.8*10⁸ N

• 8.2*10^-8 N

• 6.2*10¹⁰ N

• 2.3*10⁶ N