Moving Charges and Magnetism Test

Result

Moving Charges and Magnetism Test - 74

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Weekly Quiz Competition

Question 1
4 / -1

A current carrying loop is placed in a uniform magnetic field in four different orientations. Fig Arrange them in the decreasing order of potential energy

A
4,2,3,1

B
1,4,2,3

C
4,3,2,1

D
1,2,3,4

Solution
Question 2
4 / -1

An infinitely long straight conductor is bent into the shape as shown in Fig. it carries a current I ampere and radius of the circular loop is a metre. The magnetic field at the centre of the loop is

A

B

C

D
none of these

Solution
Question 3
4 / -1

The magnetic field B at the center of a circular coil of radius r is π times that due to a long straight wire at a distance r from it, for equal currents. Figure here shows three cases: in all cases the circular part has radius r and straight ones are infinitely long. For same current the magnetic field B at the centre P in cases I, II, III have the ratio

A

B

C

D

Solution
Question 4
4 / -1

A

B

C
1

D
2/3

Solution
Question 5
4 / -1

An equilateral triangle of side length l is formed from a piece of wire of uniform resistance. The current I is fed as shown in the fig. The magnitude of the magnetic field at its centre O is

A

B

C

D
zero

Solution
Question 6
4 / -1

A long straight wire carrying current I is bent into the shape as shown in the Fig. The circular portion of the wire has radius 10/π m. The centre of this circle is at a distance 1 m from the straight portion of the wire. The magnetic field at the centre O of the circular portion will be equal to (π² = 10)

A

B

C

D
zero

Solution
Question 7
4 / -1

A square loop ABCD, carrying a current I₂, is placed near and coplanar with a long straight conductor XY carrying a current I₁, as shown in the Fig. The net force on the loop will be

A

B

C

D

Solution
Question 8
4 / -1

A

B

C

D

Solution
Question 9
4 / -1

A long, straight wire is turned into a loop of radius 10cm (see figure). If a current of 8 amperes is passed through the loop, then the value of the magnetic field and its direction at the centre C of the loop shall be close to

A
5.0 × 10^–5 Newton/(amp-meter), upward

B
3.4 × 10^–5 Newton/(amp-meter), upward

C
1.6 × 10^–5 Newton/(amp-meter), downward

D
1.6 × 10^–5 Newton/(amp-meter), upward

Solution
Question 10
4 / -1

The magnetic induction due to an infinitely long straight wire carrying a current i at a distance r from wire is given by

A

B

C

D