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The amount of charge Q passed in time t through a cross-section of a wire is Q = 5t2 + 3t + 1. The value of current at time t = 5 s is

9 A

49 A

53 A

none of these

Three charges each of +1?C are placed at the corners of an equilateral triangle. If the force between any two charges be F, then the net force on either charge will be

2 F

3 F

Given that q1 + q2 = q. For what ratio q1/q will the force between q1 and q2 be maximum?

0.25

0.5

1

2

An insulated sphere of radius R has charge density ?. The electric field at a distance r from the centre of the sphere (r < R)

Two point charges +3?C and +8?C repel each other with a force of 40 N. If a charge of –5?C is added to each of them, then the force between them will become

–10 N

+10 N

+20 N

–20 N

Two point charges exert on each other a force F when they are placed r distance apart in air. When they are placed R distance apart in a medium of dielectric constant K, they exert the same force. The distance R equals:

r K

Two conducting spheres of radii r1 and r2 are at the same potential. The ratio of the their charges is

r1/r2

r2/r1

Two conducting spheres of radii r1 and r2 are equally charged. The ratio of their potential is

r1/r2

r2/r1

An electron of mass ‘m’ and charge ‘e’ is accelerated from rest through a potential difference ‘V’ in vacuum. Its final speed will be

eV / 2m

eV/m

A large insulated sphere of radius ‘r’ charged with ‘Q’ units of electricity is placed in contact with a small insulated sphere of radius r' and is then separated. The charge on smaller sphere will now be

Q (r + r)

Q (r + r')

The electric potential V is given as a function of distance x (metre) by V = (5x2 + 10x – 4) volt. Value of electric field at x = 1 m is

–23 V/m

11 V/m

6 V/m

–20 V/m

A straight wire of length l and electric dipole moment p is bent to form a semicircle. The new dipole moment would be

p/2

p/2?

2p

Q, 2Q

C

2 C

3 C

4 C

10(

20(

30(

40(

9 A

49 A

53 A

none of these

Three charges each of +1?C are placed at the corners of an equilateral triangle. If the force between any two charges be F, then the net force on either charge will be

2 F

3 F

Given that q1 + q2 = q. For what ratio q1/q will the force between q1 and q2 be maximum?

0.25

0.5

1

2

An insulated sphere of radius R has charge density ?. The electric field at a distance r from the centre of the sphere (r < R)

Two point charges +3?C and +8?C repel each other with a force of 40 N. If a charge of –5?C is added to each of them, then the force between them will become

–10 N

+10 N

+20 N

–20 N

Two point charges exert on each other a force F when they are placed r distance apart in air. When they are placed R distance apart in a medium of dielectric constant K, they exert the same force. The distance R equals:

r K

Two conducting spheres of radii r1 and r2 are at the same potential. The ratio of the their charges is

r1/r2

r2/r1

Two conducting spheres of radii r1 and r2 are equally charged. The ratio of their potential is

r1/r2

r2/r1

An electron of mass ‘m’ and charge ‘e’ is accelerated from rest through a potential difference ‘V’ in vacuum. Its final speed will be

eV / 2m

eV/m

A large insulated sphere of radius ‘r’ charged with ‘Q’ units of electricity is placed in contact with a small insulated sphere of radius r' and is then separated. The charge on smaller sphere will now be

Q (r + r)

Q (r + r')

The electric potential V is given as a function of distance x (metre) by V = (5x2 + 10x – 4) volt. Value of electric field at x = 1 m is

–23 V/m

11 V/m

6 V/m

–20 V/m

A straight wire of length l and electric dipole moment p is bent to form a semicircle. The new dipole moment would be

p/2

p/2?

2p

Q, 2Q

C

2 C

3 C

4 C

10(

20(

30(

40(

AIEEE, IIT-JEE Physics - Current Electricity - 2

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682 days 20 hours 25 minutes ago

dan ketertahanan terhadap pengaruh luar (korosi, aus, bahan kimia, suhu tinggi dan sebagainya).

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1792 days 18 hours 44 minutes ago

natrium, dan barium.

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emas, perak, dan platina.

Logam tahan api : wolfram, molibden, titanium, dan zirkonium.

Dalam penggunaan serta pemakaiannya, logam pada umumnya tidak merupakan

1792 days 18 hours 46 minutes ago

Nice exam

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1834 days 19 hours 42 minutes ago

its easy. And actually it was nothing as compared to iit jee level.

2446 days 8 hours 29 minutes ago

nice test .......but I want topic wise mock tests in maths physics and chemistry leveling IIT JEE standards

2460 days 16 hours 39 minutes ago

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