Charging by Induction

Q. Two identical conductors of copper and aluminium are placed in an identical electric fields. The magnitude of induced charge in the aluminium will be

1. Zero
2. Less than in copper
3. Equal to that in copper
4. Greater than in copper

Q.

An electroscope is given a positive charge, causing its foil leaves to separate. When an object is brought near the top plate of the electroscope, the foils separate even further because, ___.

1. the object is negatively charged

2. the object is positively charged

3. None of the above

4. the object is electrically neutral

Q.

Two identical metal spheres P and Q are supported on insulating stands and placed in contact. What kind of charges will P and Q develop when a negatively charged ebonite rod is brought near P?

1. P will have a positive charge and Q will have a negative charge

2. P will have a negative charge and Q will have a positive charge

3. Both p and Q will have positive charge

4. Both p and Q will have negative charge

Q.

A photocopier is a machine that makes paper copies of documents and other visual images quickly and cheaply. Most current photocopiers use a technology in which toner particles are positively charged and then transfer them onto paper in the form of an image/letters.

What charge should the paper possess for this process to happen?

1. Only Neutral

2. Only Negative

3. both b and c

4. Only Positive

Q. Two identical conductors of copper and aluminium are placed in an identical electric fields. The magnitude of induced charge in the aluminium will be

1. Greater than in copper
2. Equal to that in copper
3. Zero
4. Less than in copper

Q. When a body X is charged by induction with a positively charged body Y, the induced charge on body X will be .

1. Negative
2. Positive
3. Neutral
4. Cannot say

Q. In spherical conductor, a spherical cavity is present, a point charge $+q$ is placed at some distance from the center of cavity, then charge induced at surface 1 and surface 2.

1. at surface 1, charge induced is $-q$ but uniformly distributed.
2. At surface 2, charge is $-q$ and non uniformly distributed.
3. at surface 2, charge induced is $+q$ but charge is non uniformly distributed.
4. At surface 1, charge is $-q$ but non uniformly distributed.

Q. In spherical conductor, a spherical cavity is present, a point charge $+q$ is placed at some distance from the center of cavity, then charge induced at surface 1 and surface 2.

1. at surface 1, charge induced is $-q$ but uniformly distributed.
2. At surface 2, charge is $-q$ and non uniformly distributed.
3. at surface 2, charge induced is $+q$ but charge is non uniformly distributed.
4. At surface 1, charge is $-q$ but non uniformly distributed.

Q.

There identical metal plates with large surface areas are kept parallel to each other as shown in figure (30-E8). The leftmost plate is given a charge Q, the rightmost a charge -2 Q and the middle one remains neutral. Find the charge appearing on the outer surface of the rightmost plate.

Q. A body can be negatively charged by :

1. Removing some electrons from it
2. Giving excess of electrons to it
3. Giving some protons to it
4. Removing some neutrons from it