Page 338 - General Knowledge

GENERAL KNOWLEDGE 2019

C. Radio
D. All of the above

145. What kind of magnetic field lines will be produced around a straight wire carrying
current?
A. Bigger circles
B. Straight
C. Concentrated circles
D. Parallel straight

146. According to Maxwell‘s right-hand thumb rule, what gives the direction of magnetic
field lines around the wire?
A. Direction of thumb
B. Direction of fingers encircling wire
C. Direction opposite to thumb
D. Direction of index finger

147. Maxwell‘s right-hand thumb rule is also known as:
A. Biot-Savart law
B. Hall Effect
C. Born rule
D. Corkscrew rule

148. Which of the following current carrying wires will have strong magnetic field?
A. Straight
B. Circular loop
C. Solenoid
D. All of the above

149. The strength of magnetic field produced by a current carrying circular coil can be
increased by:
A. Increasing number of turns of wire
B. Increasing current flow
C. Decreasing radius of coil
D. All of the above

150. What is a long coil containing a large number of close turns of insulated copper wire
called?
A. Straight
B. Solenoid
C. Circular loop
D. Stranded

151. The magnetic field produced by a current carrying solenoid is similar to the
magnetic field produced by a:
A. Bar magnet

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