Physics Test 192

Result

Physics Test 192

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Question 1
4 / -1

A non-conducting rod AB of length l has a total charge q. The rod is rotated about an axis passing through its center of mass with a constant angular velocity ω as shown in the figure. The magnetic moment of the rod is

A

B

C

D

Solution
Question 2
4 / -1

The distance between two parallel plates of a capacitor is a. A conductor of thickness b(b < a) is inserted between the plates as shown in the figure. The variation of effective capacitance between the plates of the capacitor as a function of the distance (x) is best represented by

A

B

C

D

Solution
Question 3
4 / -1

A solid sphere of radius R, and dielectric constant ‘k’ has spherical cavity of radius R/4. A point charge q₁ is placed in the cavity. Another charge q₂ is placed outside the sphere at a distance of r from q₁. Then Coulombic force of interaction between them is found to be ‘F₁’. When the same charges are separated by same distance in vacuum then the force of interaction between them is found to be F₂ then

A
F₁ = F₂ / k

B
F₂ = F₁ / k

C
F₁ F₂ = 1/k

D
F₁ = F₂

Solution
Question 4
4 / -1

Energy stored in the capacitor in it’s steady state is

A
CV

B
CV/2

C

D
Zero

Solution

Potential across capacitor is zero, hence energy stored is zero.
Question 5
4 / -1

A point charge of 0.1C is placed on the circumference of a non-conducting ring of radius 1m which is rotating about an axis passing from centre and perpendicular to the plane of ring with a constant angular acceleration of 1 rad/sec². If ring starts from rest at t = 0, the magnetic field at the centre of the ring at t = 10 sec, is

A
10^–6 T

B
10^–7 T

C
10^–8 T

D
10⁷ T

Solution
Question 6
4 / -1

In an L – C circuit shown in the figure, C = 1F, L = 4H. At time t = 0, charge in the capacitor is 4C and it is decreasing at a rate of √5 C/s. Choose the correct statements.

A
maximum charge in the capacitor can be 6C

B
maximum charge in the capacitor can be 8C

C
charge in the capacitor will be maximum after time 2 sin^–1(2/3) sec

D
None of these

Solution
Question 7
4 / -1

A solid conducting sphere of radius r is having a charge Q and point charges +q and –q are kept at distances d from the center of sphere as shown in the figure. The electric potential at the centre of solid sphere

A

B

C

D

Solution
Question 8
4 / -1

Consider the circuit in the adjacent figure. What will be potential difference between A and B in the steady state

A
ε

B
ε / 2

C
ε / 3

D
zero

Solution

There will be no current any where in the circuit.
Question 9
4 / -1

A charge q is placed at some distance along the axis of a uniformly charged disc of surface charge density σ C/m². The flux due to the charge q through the disc is ϕ. The electric force on charge q exerted by the disc is

A
σϕ

B
σϕ/4π

C
σϕ/2π

D
σϕ/3π

Solution
Question 10
4 / -1

In the given circuit diagram, find the heat generated on closing the switch S. (Initially the capacitor of capacitance C is uncharged)

A

B
CV²

C

D
2CV²

Solution

Only charge is that capacitor 'C' will get charged.