Electric Charges and Fields Test

Result

Electric Charges and Fields Test - 12

Score
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Weekly Quiz Competition

Question 1
1 / -0

A tennis ball which has been covered with charges is suspended by a thread so that it hangs between two metal plates. One plate is earthed, while other is attracted to a high voltage generator. The ball

A
is repelled by earthed plate and stays there

B
hangs without moving

C
swings backward & forward hitting each plate in turn

D
is attracted to the high voltage plate and stays there

Solution

When the other piate is connected to the high voltage generator, the negative charge induced on the ball cause attraction. When it strikes the +ve plate charge distribution again takes piace. This causes repulsion. Hence, the ball swings backward and forward hitting each plate in tum.
Question 2
1 / -0

A system has two charges q_A= 2.5 × 10⁻⁷Cand q_B= − 2.5 × 10⁻⁷C located at points A(0, 0, -15cm) and B(0, 0, +15cm), respectively. What are the total charge and electric dipole moment of the system?

A
zero, 5.5 × 10⁻⁸Cm

B
zero, 8.5 × 10⁻⁸Cm

C
zero, 7.5 × 10⁻⁸Cm

D
zero, 6.5 × 10⁻⁸Cm

Solution

Total charge = 2.5 × 10⁻⁷ − 2.5 × 10⁻⁷ = 0
Dipole moment = either charge × separation between charges

= 2.5 × 10⁻⁷ × 30 × 10⁻² = 7.5 × 10⁻⁸cm