Moving Charges and Magnetism Test

Result

Moving Charges and Magnetism Test - 30

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Weekly Quiz Competition

Question 1
4 / -1

A neutral point is obtained at the centre of a vertical circular coil carrying current. The angle between the plane of the coil and the magnetic meridian is

A
0

B
45^o

C
60^o

D
90^o

Solution
Question 2
4 / -1

One Tesla is equal to

A
10⁷ gauss

B
10^–4 gauss

C
10⁴ gauss

D
10^–8 gauss

Solution
Question 3
4 / -1

A current carrying wire in the neighbourhood produces

A
No field

B
Electric field only

C
Magnetic field only

D
Electric and magnetic fields
Question 4
4 / -1

A wire PQR is bent as shown in figure and is placed in a region of uniform magnetic field B. The length of PQ = QR = l. A current I ampere flows through the wire as shown. The magnitude is of the force on PQ and QR will be

A
BIl, 0

B
2BIl, 0

C
0, BIl

D
0, 0
Question 5
4 / -1

Energy in a current carrying coil is stored in the form of

A
Electrical energy

B
Magnetic field

C
Heat

D
None of these
Question 6
4 / -1

The magnetic field at the centre of coil of n turns, bent in the form of a square of side 2l, carrying current i, is

A

B

C

D

Solution
Question 7
4 / -1

Which of the following gives the value of magnetic field according to Biot-Savart\'s law?

A

B

C

D
Question 8
4 / -1

A wire oriented in the east-west direction carries a current eastward. Direction of the magnetic field at a point to the south of wire is

A
Vertically down

B
Vertically up

C
North-east

D
South-east
Question 9
4 / -1

Magnetic field due to a ring having n turns at a distance xon its axis is proportional to (if r = radius of ring)

A

B

C

D

Solution
Question 10
4 / -1

A and B are two concentric circular conductors of centre Oand carrying currents i₁ and i₂ as shown in the adjacent figure. If ratio of their radii is 1 : 2 and ratio of the flux densities at Odue to A and B is 1 : 3, then the value of i₁ /i₂ is

A
1/6

B
1/4

C
1/3

D
1/2

Solution