Moving Charges and Magnetism Test

Result

Moving Charges and Magnetism Test - 25

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Question 1
4 / -1

An electron whose e/m is 1.76 × 10¹¹C/kg enter a region where there is a uniform magnetic field of induction 2 × 10^-3 tesla with a velocity of 3 × 10⁶ m/sec in a direction making an angle of 45^o with the field. The pitch of its helical path in the region is

A
1.2 cm

B
3.8 cm

C
5.36 cm

D
8.4 cm

Solution
Question 2
4 / -1

A candidate connects a moving coil voltmeter V and moving coil ammeter A and resistor R as shown in Fig ?

A
equal to 5 ohm

B
greater than 5 ohm

C
less than 5 ohm

D
greater or less than 5 ohms depending upon its material.
Question 3
4 / -1

The magnetic field at the centre of a loop of a circular wire of radius r carrying current I may be taken as B₀ .If a particle of charge q moving with speed v passes the centre of semicircular wire, as shown in Fig. along the axis of the wire, the force on it due to the current is

A
zero

B

C

D

Solution
Question 4
4 / -1

Three infinitely long conductors A, B and C carrying currents as shown in the fig. the position of the point lying on the straight line AC where the magnetic field is zero is between

A
A and B at a distance 3.2 cm from B

B
B and C at a distance 3.2 cm from A

C
A and B at a distance of 1.8 cm from B

D
B and C at a distance of 1.8 cm from B

Solution
Question 5
4 / -1

What is the magnetic field induction at the centre O of the arc in the Fig.?

A

B

C

D

Solution
Question 6
4 / -1

A conductor AB of length L carrying a current I₂, is placed perpendicular to a long straight conductor XY carrying current I₁, as shown in Fig. the force on AB is magnitude is

A

B

C

D

Solution
Question 7
4 / -1

A charge +q is moving along positive x – direction From origin it follows trajectory (non circular) as shown in Fig. The electric and magnetic fields existing in the region to the right of y – axis may be

A

B

C

D
Question 8
4 / -1

A length L of wire carries a steady current I. It is bent first to form a circular plane coil of one turn. The same length is now bent more sharply to give a double loop of smaller radius. The magnetic field at the centre caused by the same current is

A
A quarter of its first value

B
Unaltered

C
Four times of its first value

D
A half of its first value

Solution
Question 9
4 / -1

If a copper rod carries a direct current, the magnetic field associated with the current will be

A
Only inside the rod

B
Only outside the rod

C
Both inside and outside the rod

D
Neither inside nor outside the rod
Question 10
4 / -1

A
8

B
3

C
7

D
None of these

Solution