Physics Test 172

Result

Physics Test 172

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
4 / -1

A and C are concentric conducting spherical shells of radius a and c respectively. A is surrounded by a concentric dielectric medium of inner radius a, outer radius b and dielectric constant K as shown in the figure. If sphere A is given a charge Q, the potential at the outer surface of the dielectric is.

A

B

C

D
None of these

Solution

Charge on outer surface of C = - charge on inner surface of C

Hence potential at B due to charge on conductor C = 0 charge on outer surface of dielectric = - charge on inner surface of dielectric
Question 2
4 / -1

In the given circuit the rms value of voltage across the capacitor C, inductor L and resister R₁ are 12V, 10V and 5V respectively. Then the peak voltage across R₂ is

A

B

C

D
None of these

Solution

In parallel combination each branch should have equal potential but in AC circuit in a branch
Question 3
4 / -1

Two identical capacitors C₁ and C₂ are connected in series with a battery. They are fully charged. Now a dielectric slab is inserted between the plates of C₂. The potential difference across C₁ will :

A
increase

B
decrease

C
remain same

D
depend on internal resistance of the cell

Solution

When dielectric is inserted, C₂ will increase. So V₁ will increase.
Question 4
4 / -1

A solenoid having an iron core has its terminals connected across an ideal DC source. If the iron core is removed, the current flowing through the solenoid

A
increases

B
decreases

C
remains unchanged

D
nothing can be said

Solution

Current will have to increase in order to oppose the cause (decrease in flux).
Question 5
4 / -1

An electric field ‘E’ whose direction is radially outward varies as distance from origin ‘r’ as shown in the graph. E is taken as positive if its direction is away from the origin. Then the work done by electric field on a 2 C charge if it is taken from (1, 1, 0) to (3, 0, 0) is

A

B
–60 J

C
60 J

D

Solution
Question 6
4 / -1

A negative test charge is moving near a long straight current carrying wire. A force will act on the test charge in a direction parallel to the direction of the current, if the motion of the charge is in a direction:

A
towards wire

B
the same as that of current

C
opposite to that of current

D
perpendicular to both the direction of current and the direction towards wire.

Solution
Question 7
4 / -1

Potential difference between centre and the surface of sphere of radius R and having uniform volume charge density ρ within it will be :

A

B

C
0

D

Solution
Question 8
4 / -1

The magnetic field at the origin due to the current flowing in the wire is

A

B

C

D

Solution
Question 9
4 / -1

There exists a uniform electric field in the space as shown. Four points A, B, C and D are marked which are equidistant from the origin. If V_A, V_B, V_C and V_D are their potentials respectively, then

A

B

C

D

Solution

Four lines, perpendicular to lines of electric field and passing through A, B, C and D are drawn. These are equipotential lines. As potential decreases in the direction of electric field, therefore V_A > V_B > V_D > V_C
Question 10
4 / -1

A current carrying wire AB of the length L is turned along a circle, as shown in figure. The magnetic field at the centre O.

A

B

C

D

Solution