Moving Charges and Magnetism Test

Result

Moving Charges and Magnetism Test - 12

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Weekly Quiz Competition

Question 1
4 / -1

The earth\'s magnetic induction at certain point is 7 × 10^–5 Wb/m². This is to be annulled by the magnetic induction at the centre of a circular conducting loop of radius 5 cm. The required current in the loop is

A
0.56 A

B
5.6 A

C
0.28 A

D
2.8 A

Solution
Question 2
4 / -1

A straight wire carrying a current 10 A is bent into a semicircular arc of radius 5 cm. The magnitude of magnetic field at the centre is

A
1.5 × 10^–5 T

B
3.14 × 10^–5 T

C
6.28 × 10^–5 Tq

D
19.6 × 10^–5 T

Solution
Question 3
4 / -1

An electric current passes through a long straight wire. At a distance 5 cm from the wire, the magnetic field is B. The field at 20 cm from the wire would be

A
B/6

B
B/4

C
B/3

D
B/2

Solution
Question 4
4 / -1

When a certain length of wire is turned into one circular loop, the magnetic induction at the centre of coil due to some current flowing is B₀. If the same wire is turned into three loops to make a circular coil, the magnetic induction at the centre of this coil for the same current will be

A
B₀

B
9B₀

C
3B₀

D
27B₀

Solution
Question 5
4 / -1

The current in the windings on a toroid is 2.0 A. There are 400 turns and the mean circumferential length is 40 cm. If the inside magnetic field is 1.0 T, the relative permeability is near to

A
100

B
200

C
300

D
400

Solution
Question 6
4 / -1

A long solenoid carrying a current produces a magnetic field B along its axis. If the current is doubled and the number of turns per cm is halved, the new value of the magnetic field is

A
B

B
2B

C
4B

D
B/2

Solution
Question 7
4 / -1

The earth\'s magnetic field at a given point is 0.5 × 10^–5 Wb-m^–2. This field is to be annulled by magnetic induction at the center of a circular conducting loop of radius 5.0 cm. The current required to be flown in the loop is nearly

A
0.2 A

B
0.4 A

C
4A

D
40A

Solution
Question 8
4 / -1

The magnetic moment of a current (i) carrying circular coil of radius (r) and number of turns (n) varies as

A
1/r²

B
1/r

C
r

D
r²

Solution
Question 9
4 / -1

When the current flowing in a circular coil is doubled and the number of turns of the coil in it is halved, the magnetic field at its centre will become

A
Four times

B
Same

C
Half

D
Double

Solution
Question 10
4 / -1

The field due to a long straight wire carrying a current I is proportional to

A
I

B
I³

C
√I

D
1/I

Solution