Charges on Conductors
Trending Questions
Q. A cavity of radius r is made inside a solid sphere. The volume charge density of the remaining sphere is ρ. An electron (charge e , mass m) is released inside the cavity from point P as shown in figure. The center of sphere and center of cavity are seperated by a distance a. The time after which the electron again touches the sphere is
- √6√2 ε0meρ
- √√2 ε0meρ
- √6 ε0meρ
- √ε0meρ
Q. Nine point charges placed at the vertices of an octagon and centre of an octagon as shown in the figure.
Net force experienced by +q charge at the centre of the octagon is zero. If any two charges are removed simultaneously from the vertex, it observed that net force on charge +q is still zero, then the charges will be
Net force experienced by +q charge at the centre of the octagon is zero. If any two charges are removed simultaneously from the vertex, it observed that net force on charge +q is still zero, then the charges will be
- any pair of diagonally opposite charges
- −4Q and +3Q
- +Q and −Q
- +3Q and +2Q
Q.
Does electric potential cancel out?
Q. An electric field of magnitude 105 N/C points due west at certain point. The magnitude of the force that acts on a charge of +2 μC and −5 μC at this point respectively are
- 0.5 N and 0.2 N
- 1 N and 0.3 N
- 0.2 N and 0.5 N
- 2 N and 0.1 N
Q. Find the magnitude of the electric field (|−−→Eind|) at point A due to the induced charges on the sphere.
- KQ4
- KQ16
- KQ25
- KQ5
Q. In electrostatic condition, the net charge inside a conductor is always zero.
- True
- False
Q. Any excess charge given to any conductor resides on its surface such that there is no electric field inside the volume of the conductor.
- True
- False
Q. A charge of Q coulomb is placed on a solid piece of metal of irregular shape. The charge will distribute itself
- Uniformly in the metal object
- Uniformly on the surface of the object
- Such that the potential energy of the system is minimised
- Such that the total heat loss is minimised
Q. Conducting body is connected to Earth, a point charge (Q) is at distance r from point C, potential at point C is
- kQr
- zero
- Kq2r
- KQ3r
Q. An electric field of magnitude 105 N/C points due west at certain point. The magnitude of the force that acts on a charge of +2 μC and −5 μC at this point respectively are
- 2 N and 0.1 N
- 0.2 N and 0.5 N
- 0.5 N and 0.2 N
- 1 N and 0.3 N
Q. A parallel-plate capacitor is connected to a battery as shown in the figure. A conducting plate is inserted mid-way between the two plates. Take the plate area as A. The distance between each plate in the new configuration is d.
If the middle and upper plates are short circuited, the extra charge flown through the battery is
If the middle and upper plates are short circuited, the extra charge flown through the battery is
- ε0AVd
- Zero
- ε0AV2d
- 2ε0AVd
Q. A parallel plate capacitor of capacitance 10μF is connected across a battery of e.m.f. 5 mV. Now, the space between the plates of the capacitor is filled with a dielectric material of dielectric constant K=5. Then, the charge that flows through the battery, till equilibrium is reached is
- 250 μC
- 250 nC
- 200 nC
- 200 μC
Q. The metal plate on the left in figure carries a charge +q. The metal plate on the right has a charge of −2q. What charge will flow through S when it is closed, if central plate is initially neutral
- zero
- −q
- +q
- +2q
Q. A point charge q1 is placed inside cavity 1 and another point charge q2 is inside cavity 2. If a point charge q is placed outside the conductor then the charge on outer surface of the conductor would be
- Q+q1+q2 and it is non-uniformly distributed.
- Q+q1+q2 and its uniform or non-uniform distribution depending upon locations of q1 and q2.
- Q+q1+q2 and the distribution depends upon the locations of q1 , q2 and q.
- Q+q1+q2 and would be distributed uniformly.
Q. Conducting body is connected to Earth, a point charge (Q) is at distance r from point C, potential at point C is
- kQr
- zero
- Kq2r
- KQ3r
Q. A large non-conducting sheet M is given a uniform charge density. Two uncharged small metal rods A and B are placed near the sheet as shown in figure. Which of the following options is incorrect?
- M attracts A
- A attracts B
- M attracts B
- B repels A
Q. Four metal conductors having different shapes
1. A sphere
2. Cylindrical
3. Pear
4. Lightning conductor
Which shape will sustain its charge for the longest time?
1. A sphere
2. Cylindrical
3. Pear
4. Lightning conductor
Which shape will sustain its charge for the longest time?
- 1
- 2
- 3
- 4