Ch 4. Moving Charges And Magnetism

Question 1

If T is time period and V is maximum speed of a charged particle in cyclotron, then

Answer 1

T ∝ V•

T inversely proportional to V degree

Question 2

If any ammeter is shunted, then the total resistance of the circuit

Answer 2

Decreases

Question 3

Expression of force on a charge q moving with velocity v in a magnetic field B is

Question 4

Magnetic field of 5 Tesla is equal to

Answer 4

5 × weber/(metre)²

Question 5

Which of the expression is correct for Lorentz force?

Answer 5

F = q (E + V × B)

Question 6

A charge q moves in a region where electric field ‘E’ and magnetic field ‘B’ both exist, then force on it is

Answer 6

q [ E + (v × B) ]

Question 7

A circular coil of Radius R carries a current I. The magnetic field at its centre is B. At what distance from the centre, on the axis of the coil, the magnetic field will be B/8

Answer 7

√3R

Question 8

Dimension of magnetic field is

Answer 8

I⁻¹ ML⁰T⁻²

Question 9

Which of the following is the correct vector form of the equation of Biot-savart law?

Answer 9

dB = µ₀/4π I (dl × r)/r³

Question 10

Electromagnetic movement of current carrying coil is

Answer 10

NI A

Question 11

Voltameter measures

Answer 11

A. Resistance B. Potential difference C. Current

Ans- None of these

Question 12

The resistance of ideal ammeter is

Answer 12

Zero

Question 13

The resistance of ammeter is

Answer 13

Very small

Question 14

When an ammeter is shunted its measuring range

Answer 14

Increases

Question 15

Which of the following is correct for galvanometer constant

Answer 15

C/NAB

Question 16

Which of the following is correct for galvanometer constant